CoronaVac, also known as the Sinovac COVID-19 vaccine, was a
whole inactivated virus COVID-19 vaccine
A COVID19 vaccine is a vaccine intended to provide acquired immunity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes coronavirus disease 2019 ( COVID19).
Knowledge about the structure and fun ...
developed by the Chinese company
Sinovac Biotech.
It was
phase III clinically trialled in Brazil, Chile,
Indonesia,
the Philippines, and Turkey and relies on traditional technology similar to other inactivated-virus COVID-19 vaccines, such as the
Sinopharm BIBP vaccine, another Chinese vaccine, and
Covaxin
Covaxin (list of pharmaceutical compound number prefixes, development name, BBV152) is a Inactivated vaccine, whole inactivated virus-based COVID-19 vaccine developed by Bharat Biotech in collaboration with the Indian Council of Medical Res ...
, an Indian vaccine.
CoronaVac does not need to be frozen, and both the final product and the raw material for formulating CoronaVac can be transported refrigerated at 2–8 °C (36–46 °F), the temperatures at which flu vaccines are kept.
A real-world study of tens of millions of Chileans who received CoronaVac found it to be 66% effective against symptomatic COVID-19, 88% effective against hospitalization, 90% effective against ICU admissions, and 86% effective against deaths.
In Brazil, after 75% of the population in
Serrana, São Paulo, received CoronaVac, preliminary results show deaths fell by 95%, hospitalizations by 86%, and symptomatic cases by 80%. In Indonesia, real-world data from 128,290 healthcare workers showed 94% protection against symptomatic infection by the vaccine, beating results in clinical trials.
Phase III results from Turkey, published in ''
The Lancet
''The Lancet'' is a weekly peer-reviewed general medical journal, founded in England in 1823. It is one of the world's highest-impact academic journals and also one of the oldest medical journals still in publication.
The journal publishes ...
'', showed an efficacy of 84% based on 10,218 participants in the trials.
Phase III results from Brazil previously showed 50.7% efficacy in preventing symptomatic infections and 83.7% effectiveness in preventing mild cases needing treatment. Efficacy against symptomatic infections increased to 62.3% with an interval of at least 21 days between the doses.
CoronaVac is being used in vaccination campaigns in various countries in Asia,
South America,
Central America,
and Eastern Europe.
By April 2021, Sinovac had a production capacity of 2 billion doses per year.
It was manufactured at several facilities in China,
with overseas manufacture planned for Brazil in September 2021
and eventually Egypt
and Hungary.
On 1 June 2021, the
World Health Organization
The World Health Organization (WHO) is a list of specialized agencies of the United Nations, specialized agency of the United Nations which coordinates responses to international public health issues and emergencies. It is headquartered in Gen ...
(WHO) validated the vaccine for emergency use.
Sinovac has signed purchase agreements for 380 million doses from
COVAX. As of July 2021, CoronaVac was the most widely used COVID-19 vaccine in the world, with 943 million doses delivered.
As of 14 October 2021, CoronaVac is the COVID-19 vaccine with the most doses administered worldwide.
It was reported in December 2021 that a study jointly conducted by the
LKS Faculty of Medicine, The University of Hong Kong (HKUMed), and the
Faculty of Medicine, The Chinese University of Hong Kong (CU Medicine), showed that a third dose of the
Comirnaty vaccine given to those who received two doses of either Comirnaty or CoronaVac provided protective levels of measured antibodies against the
Omicron variant of SARS-CoV-2. Three doses of CoronaVac, however, did not provide adequate levels of protective antibodies by the same measure, in direct contradiction to claims made by the vaccine manufacturer.
In October 2022, a Hong Kong study found that two doses of CoronaVac provided protection of only 64% to 75% for older adults. However, an extra booster or a third dose of CoronaVac was able to raise the level of protection against COVID-19 to about 98%.
In January 2024, Sinovac confirmed that it had discontinued production of CoronaVac.
Medical uses
The vaccine is given by
intramuscular injection
Intramuscular injection, often abbreviated IM, is the medical injection, injection of a substance into a muscle. In medicine, it is one of several methods for parenteral, parenteral administration of medications. Intramuscular injection may be ...
into the
deltoid muscle
The deltoid muscle is the muscle forming the rounded contour of the shoulder, human shoulder. It is also known as the 'common shoulder muscle', particularly in other animals such as the domestic cat. Anatomically, the deltoid muscle is made up o ...
. The initial course consists of two doses. The
World Health Organization
The World Health Organization (WHO) is a list of specialized agencies of the United Nations, specialized agency of the United Nations which coordinates responses to international public health issues and emergencies. It is headquartered in Gen ...
(WHO) recommends an interval of 4 weeks between doses, with data from Chile suggesting that a longer interval provides more robust immunity.
Early evidence suggested that immunity wanes rapidly, so a
booster dose after the initial course might be needed.
Effectiveness
In Brazil, a study was conducted in
Serrana, population 45,000, where authorities attempted to vaccinate the entire adult population with CoronaVac. After 75% of the adult population received the vaccine, preliminary results show deaths fell by 95%, hospitalizations by 86% and symptomatic cases by 80%. According to Ricardo Palacios, a director at São Paulo's
Instituto Butantan, "The most important result was understanding that we can control the pandemic even without vaccinating the entire population."
In July 2021, researchers from the
Chilean Ministry of Health published a paper containing real-world data for their vaccination campaign. The study was conducted between 2 February and 1 May 2021, consisting of 10.2 million people. The effectiveness of CoronaVac vaccine after the second dose was in preventing symptomatic disease, for hospitalization, for ICU admission, and in preventing COVID-19 related deaths. The effectiveness after the first dose was against symptomatic disease, against hospitalization, against ICU admission, and against deaths. The study concluded that the vaccine was effective in preventing COVID-19.
In May 2021, real-world data from Indonesia showed the vaccine was highly effective, with 94% of inoculated health care workers protected against symptomatic infection by the vaccine, besting results of clinical trials.
In this study of 128,290 health workers in Jakarta, less than 1% of the vaccinated healthcare workers contracted symptomatic COVID-19, compared to more than 8% among the unvaccinated healthcare workers. The vaccine reduced the risk of hospitalization and death of the inoculated medical workers by 96% and 98% respectively.
Uruguay released real-world data based on 795,684 people who have received both doses of CoronaVac for more than 14 days as of 1 June 2021. In this group, 8,298 tested positive, 45 were admitted to the ICU, and 35 died of COVID-19. This indicated 64.52% and 61.47% effectiveness in reducing COVID-19 cases for people aged 18–49 and 50 and older respectively. The vaccine was 94.95% and 92.18% effective in reducing ICU admissions, and 95.35% and 95.2% effective to prevent deaths. Among fully-vaccinated healthcare professionals, the vaccine was 66% effective in preventing cases, and 100% effective in preventing ICU admissions and deaths.
Preliminary results from a test-negative case-control study from 19 January to 13 April 2021 in
Manaus
Manaus () is the List of capitals of subdivisions of Brazil, capital and largest city of the States of Brazil, Brazilian state of Amazonas (Brazilian state), Amazonas. It is the List of largest cities in Brazil, seventh-largest city in Brazil, w ...
suggest that, after just one dose, the vaccine is effective against asymptomatic infections and against symptomatic disease. The one-dose group consisted of 53,176 healthcare professionals. During the study, 66% of the samples were of the
Gamma variant. The same study found paradoxically reduced effectiveness against symptomatic disease in another group that received two doses, an effect attributed by the authors to unmeasured
confounding
In causal inference, a confounder is a variable that influences both the dependent variable and independent variable, causing a spurious association. Confounding is a causal concept, and as such, cannot be described in terms of correlatio ...
leading to downward bias in the efficacy estimate.
In Chile, the effectiveness against symptomatic disease dropped from 67% between February–April 2021 to 58.5% in early July. Because of this, on 11 August, Chile began giving an additional dose of the
Oxford–AstraZeneca vaccine to people over 55 who were fully vaccinated with CoronaVac before 31 March.
In October 2021, a large scale study in Chile with 2,017,878 participants reported that, with a CoronaVac booster, effectiveness against hospitalization increased from 84% to 88% and effectiveness against symptomatic disease increased from 56% to 80%. The greatest increases were seen with a heterologous
Oxford–AstraZeneca vaccine booster, resulting in 96% effectiveness against hospitalization and 93% against symptomatic disease.
A study by the University of Hong Kong in December 2021 found that a third dose of CoronaVac does not provide sufficient protection against the Omicron variant, directly contradicting the vaccine manufacturer's claim
and a study by the
Pontifical Catholic University of Chile
The Pontifical Catholic University of Chile (UC Chile; ) is a traditional private university based in Santiago, Chile. It is one of the thirteen Catholic universities existing in Chilean university system and one of the two pontifical univ ...
that it does.
In April 2022, a Singapore study by infectious diseases experts from the
National Centre for Infectious Diseases and the
Ministry of Health found that CoronaVac recipients were 4.59 times more likely to have severe COVID-19 as well as 2.37 times more likely to be infected, compared to those who took the Pfizer-BioNTech vaccine.
Variants
In the following tables, a vaccine is generally considered effective if the estimate is ≥50% with a >30% lower limit of the 95%
confidence interval. Effectiveness is generally expected to slowly decrease over time.
In the elderly
A test-negative case-control study from 17 January to 29 April 2021 in the
state of São Paulo
State most commonly refers to:
* State (polity), a centralized political organization that regulates law and society within a territory
**Sovereign state, a sovereign polity in international law, commonly referred to as a country
**Nation state, a ...
, during which 86% of the collected genotype isolates were of the
Gamma variant, with 43,774 participants aged 70 years or older, found an effectiveness after two doses of against symptomatic disease, against hospitalization and against death. After a single dose, the effectiveness was only against symptomatic disease, against hospitalization and against death, highlighting the importance of receiving the second dose.
The study also found that effectiveness against symptomatic disease decreased with increasing age:
Preliminary data from a large effectiveness study in Brazil with 61 million individuals from 18 January to 30 June 2021, when the
Gamma variant was dominant in the country, indicate that effectiveness is markedly reduced in those aged 90 or older, attributable to
immunosenescence:
Specific populations
On 21 October 2021, the WHO recommended a third dose as part of the initial course for older adults 3–6 months after the second dose and for immunocompromised individuals 1–3 months after the second dose because these groups mount a weaker immune response compared to healthy adults. Where supplies are limited, the third dose for seniors should be given after achieving high coverage with two doses.
Manufacturing
As an
inactivated vaccine
An inactivated vaccine (or killed vaccine) is a type of vaccine that contains pathogens (such as virus or bacteria) that have been killed or rendered inactive, so they cannot replicate or cause disease. In contrast, live vaccines use pathogens ...
like the
Sinopharm BIBP vaccine and
Covaxin
Covaxin (list of pharmaceutical compound number prefixes, development name, BBV152) is a Inactivated vaccine, whole inactivated virus-based COVID-19 vaccine developed by Bharat Biotech in collaboration with the Indian Council of Medical Res ...
, CoronaVac uses a more traditional technology
that is similar to the inactivated
polio vaccine
Polio vaccines are vaccines used to prevent poliomyelitis (polio). Two types are used: an inactivated vaccine, inactivated poliovirus given by injection (IPV) and a attenuated vaccine, weakened poliovirus given by mouth (OPV). The World Healt ...
. Initially, a sample of
SARS-CoV-2
Severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) is a strain of coronavirus that causes COVID-19, the respiratory illness responsible for the COVID-19 pandemic. The virus previously had the Novel coronavirus, provisional nam ...
from China was used to grow large quantities of the virus using
vero cell
Vero cells are a lineage of cells used in cell cultures. The 'Vero' lineage was isolated from kidney epithelial cells extracted from an African green monkey ('' Chlorocebus'' sp.; formerly called ''Cercopithecus aethiops'', this group of monk ...
s. From then on, the viruses are soaked in
beta-propiolactone, which deactivates them by binding to their genes, while leaving other viral particles intact. The resulting inactivated viruses are then mixed with the
adjuvant
In pharmacology, an adjuvant is a drug or other substance, or a combination of substances, that is used to increase the efficacy or potency of certain drugs. Specifically, the term can refer to:
* Adjuvant therapy in cancer management
* Anal ...
aluminium hydroxide
Aluminium hydroxide, , is found as the mineral gibbsite (also known as hydrargillite) and its three much rarer polymorphs: bayerite, doyleite, and nordstrandite. Aluminium hydroxide is amphoteric, i.e., it has both basic and acidic propert ...
.
CoronaVac does not need to be frozen, and both the vaccine and raw material for formulating the new doses could be transported and refrigerated at , temperatures at which flu vaccines are kept.
CoronaVac could remain stable for up to three years in storage, which might offer some advantage in vaccine distribution to regions where
cold chains are not developed.
In November 2020, Brazil's
Instituto Butantan began building a facility to manufacture 100 million doses of CoronaVac a year, with a target completion date in September 2021. On 10 December, São Paulo Governor João Doria said that in the interim, prior to the local manufacture of CoronaVac, Instituto Butantan aimed to
fill and finish 1 million doses of the vaccine per day.
In April 2021, Sinovac said its third manufacturing plant for Coronavac was ready and had started manufacturing bulk vaccine ingredients, doubling its annual capacity to 2 billion doses.
In April 2021,
Bio Farma of Indonesia had filled and finished 35 million doses of CoronaVac, but was facing some production delays because of diminished supply of bulk delivered CoronaVac from China.
In May 2021, Malaysian company
Pharmaniaga obtained local approval for its fill and finish CoronaVac.
In May 2021, Turkey was provided a license to produce CoronaVac.
In May 2021, Hungary announced an agreement to fill and finish CoronaVac, with the goal to eventually manufacture it locally in a new plant in
Debrecen
Debrecen ( ; ; ; ) is Hungary's cities of Hungary, second-largest city, after Budapest, the regional centre of the Northern Great Plain Regions of Hungary, region and the seat of Hajdú-Bihar County. A city with county rights, it was the large ...
.
In June 2021, Egypt announced that it would produce about 40 million doses by the end of that year. Distribution of the locally produced vaccine would begin by August and it would be used locally and sent to other African nations.
History
Clinical trials
Phase I–II
In April 2020, CoronaVac began Phase I–II trials in China with 744 participants on adults over the age 18–59, and In May, CoronaVac began Phase I–II trials in China with 422 participants on elderly adults over the age 60 and above. Preliminary results indicate that neutralizing antibodies fell below the seropositive threshold 6 to 8 months after the first two doses, and that a third dose given 6 or more months after the second dose raised neutralizing antibody levels beyond that of an initial course consisting of 3 doses.
In the
Phase II trial completed in July 2020 published in ''
The Lancet
''The Lancet'' is a weekly peer-reviewed general medical journal, founded in England in 1823. It is one of the world's highest-impact academic journals and also one of the oldest medical journals still in publication.
The journal publishes ...
'', CoronaVac showed
seroconversion of neutralising antibodies for 109 (92%) of 118 participants in the 3 μg group, 117 (98%) of 119 in the 6 μg group, after the days 0 and 14 schedule; whereas at day 28 after the days 0 and 28 schedule, seroconversion was seen in 114 (97%) of 117 in the 3 μg group, 118 (100%) of 118 in the 6 μg group. Phase II results for older adults published in ''
The Lancet
''The Lancet'' is a weekly peer-reviewed general medical journal, founded in England in 1823. It is one of the world's highest-impact academic journals and also one of the oldest medical journals still in publication.
The journal publishes ...
'' showed CoronaVac was safe and well tolerated in older adults, with neutralising antibody induced by a 3 μg dose similar to those of a 6 μg dose.
Phase III
In July 2020, Sinovac began Phase III trials to evaluate efficacy and safety on 9,000 volunteer healthcare professionals in Brazil, collaborating with Butantan Institute. On 19 October,
São Paulo
São Paulo (; ; Portuguese for 'Paul the Apostle, Saint Paul') is the capital of the São Paulo (state), state of São Paulo, as well as the List of cities in Brazil by population, most populous city in Brazil, the List of largest cities in the ...
Governor
João Doria said the first results of the clinical study conducted in Brazil proved that among the vaccines being tested in the country, CoronaVac is the safest, the one with the best and most promising immunization rates. On 23 October, São Paulo increased the number of volunteers in the trial to 13,000.
Brazil briefly paused the trials on 10 November after the suicide of a volunteer before resuming them the next day. The suicide was unrelated to the vaccine trial.
In August, a trial was started in Chile run by
Pontifical Catholic University of Chile
The Pontifical Catholic University of Chile (UC Chile; ) is a traditional private university based in Santiago, Chile. It is one of the thirteen Catholic universities existing in Chilean university system and one of the two pontifical univ ...
which was expected to include 3,000 volunteers between the ages of 18 and 65.
In August, Sinovac began trials in Indonesia with
Bio Farma in
Bandung
Bandung is the capital city of the West Java province of Indonesia. Located on the island of Java, the city is the List of Indonesian cities by population, fourth-most populous city and fourth largest city in Indonesia after Jakarta, Surabay ...
involving 1,620 volunteers.
In September, Turkey began trials with 13,000 volunteers on a two-dose 14-day interval. The monitoring process took place at 25 centers in 12 cities across the country.

In October, Sinovac began trials in China involving 1,040 volunteers.
In April 2021, Sinovac began Phase II/III trials for the elderly aged 60–80 in the Philippines involving 352 volunteers.
Children and adolescents trials
In September 2020, Sinovac began Phase I–II trials in China on children and adolescents ages 3–17. In May 2021, Sinovac began Phase IIb trials in China with 500 participants for children and adolescents 3–17 years old. In June 2021, it was announced that the vaccine was safe and immunogenic in this age group.
In July, Sinovac began Phase III trials in Chile with 14,000 participants for children and adolescents and expand from 6 months to 17 years old.
Results of Phase III trials
Peer-reviewed Phase III results from Turkey showed an efficacy of . The final efficacy rate was based on 41 infections, 32 of which had received a placebo. The vaccine prevented hospitalization and severe illness in 100% of cases, with all six people who were hospitalized in the placebo group. The final results were based on 10,218 participants in the trials.
Phase III results from Brazil submitted to Lancet showed 50.7% efficacy at preventing symptomatic infections, 83.7% effective in preventing mild cases needing treatment. Efficacy against symptomatic infections increased to 62.3% with an interval of 21 days or more between the doses. A total of 12,396 volunteers participated in the study between 21 July and 16 December 2020. All participants received at least one dose of the vaccine or placebo. Of this total, 9,823 participants received both doses.
Further detail published by Sinovac showed an efficacy against all symptomatic cases, against cases that require medical treatment, and against severe, hospitalized and fatal cases. In the placebo group (N=4870), there were 168 COVID cases, 30 cases requiring medical attention, and 10 severe cases including one death. In the vaccine group (N=4953), there were 85 COVID cases, 5 cases requiring medical attention, and no severe cases or deaths.
On 1 April 2021, a preliminary report from a
phase III clinical trial
The phases of clinical research are the stages in which scientists conduct experiments with a health intervention to obtain sufficient evidence for a process considered effective as a medical treatment. For drug development, the clinical phase ...
in Chile revealed that CoronaVac is safe and induces
humoral and
cell-mediated immunity in adults (18–59 years old) and the elderly (60 years or older) similar to previous phase II trials conducted in China with the same age groups and immunization schedule consisting of two doses with a 14-day interval. The side effects were mild and local, mainly limited to pain at the injection site, which was more common in adults.
Seroconversion rates for adults 14–28 days after the second dose were 95.6% for the
IgG specific against the S1-RBD (
receptor
Receptor may refer to:
* Sensory receptor, in physiology, any neurite structure that, on receiving environmental stimuli, produces an informative nerve impulse
*Receptor (biochemistry), in biochemistry, a protein molecule that receives and respond ...
binding domain of the S1
subunit of the
spike protein
In virology, a spike protein or peplomer protein is a protein that forms a large structure known as a spike or peplomer projecting from the surface of an viral envelope, enveloped virus. as cited in The proteins are usually glycoproteins that ...
) and 96% for
neutralizing anti-S1-RBD IgG. For the elderly, seroconversion rates were 100% 14 days and 87.5% 28 days after the second dose for the S1-RBD specific IgG, 90% 14 days, and 100% 28 days after the second dose for neutralizing anti-S1-RBD IgG. As found in
studies in animals, seroconversion rates for IgG specific against the N (
nucleocapsid
A capsid is the protein shell of a virus, enclosing its genetic material. It consists of several oligomeric (repeating) structural subunits made of protein called protomers. The observable 3-dimensional morphological subunits, which may or ma ...
)
protein
Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residue (biochemistry), residues. Proteins perform a vast array of functions within organisms, including Enzyme catalysis, catalysing metab ...
were weak for both groups, although CoronaVac contains significant amounts of the N protein. A robust increase of
T helper cells
The T helper cells (Th cells), also known as CD4+ cells or CD4-positive cells, are a type of T cell that play an important role in the adaptive immune system. They aid the activity of other immune cells by releasing cytokines. They are considere ...
(CD4
+) secreting
interferon gamma
Interferon gamma (IFNG or IFN-γ) is a dimerized soluble cytokine that is the only member of the type II class of interferons. The existence of this interferon, which early in its history was known as immune interferon, was described by E. F. ...
was detected 14 days after both doses in response to stimulation with peptides of the S protein and of other viral particles, but the response to S protein peptides was reduced in the elderly due to a natural reduction of activated CD4
+ T cells in this age group, as found in studies of other vaccines. The immune response of
cytotoxic T cell
A cytotoxic T cell (also known as TC, cytotoxic T lymphocyte, CTL, T-killer cell, cytolytic T cell, CD8+ T-cell or killer T cell) is a T lymphocyte (a type of white blood cell) that kills cancer cells, cells that are infected by intracellular ...
(CD8
+) was not as robust. The observed CD4
+ T cell response is considered a balanced immune response capable of viral clearance and is similar to that observed in other COVID-19 vaccines, such as
BNT162b1 and
Convidecia.
Variability in results
In early January 2021, Brazilian health officials announced that the vaccine had an efficacy of 78%. One week later, they revised this figure to 50.4%, stating that the revised figure now included "very mild" cases of COVID-19 among trial participants which were omitted in the earlier analysis.
Ricardo Palácios, medical director of Brazil's
Instituto Butantan, said Sinovac's relatively low efficacy rate of 50% was due to more rigorous standards for what counted as an infection among trial participants.
The Institute split cases in six categories: asymptomatic, very mild, mild, two levels of moderate, and severe; the first two didn't require medical assistance.
Possible explanations for lower efficacy rate included: trial was largely made up of frontline health care workers who were more exposed to the virus;
two vaccine doses were given at shorter intervals (2 weeks);
counting very mild cases;
and the
Gamma variant (lineage P.1), more transmissible and perhaps evaded immunity better, was circulating.
According to Instituto Butantan director Dimas Covas, the Brazilian group was considered more vulnerable to infection and exposure to higher viral loads. In Turkish and Indonesian Phase III trials, the composition of volunteers was similar to that of the general population.
Variants
On 10 March,
Instituto Butantan Director Dimas Covas said CoronaVac was efficacious against three variants of COVID-19 in the country;
Alpha
Alpha (uppercase , lowercase ) is the first letter of the Greek alphabet. In the system of Greek numerals, it has a value of one. Alpha is derived from the Phoenician letter ''aleph'' , whose name comes from the West Semitic word for ' ...
(lineage B.1.1.7),
Beta
Beta (, ; uppercase , lowercase , or cursive ; or ) is the second letter of the Greek alphabet. In the system of Greek numerals, it has a value of 2. In Ancient Greek, beta represented the voiced bilabial plosive . In Modern Greek, it represe ...
(lineage B.1.351), and lineage B.1.1.28 (identified in Brazil), from which
Gamma
Gamma (; uppercase , lowercase ; ) is the third letter of the Greek alphabet. In the system of Greek numerals it has a value of 3. In Ancient Greek, the letter gamma represented a voiced velar stop . In Modern Greek, this letter normally repr ...
and Zeta (lineages P.1 and P.2) descend.
Preliminary results from a large study of health care workers suggest one dose of CoronaVac is still about 50% effective against symptomatic COVID-19 in Manaus. In April 2021, it was reported that over 75% of new cases were being caused by the highly transmissible Gamma variant.
In June, Thailand's Public Health Ministry stated the vaccine had 71%-91% efficacy against infection by the
Alpha
Alpha (uppercase , lowercase ) is the first letter of the Greek alphabet. In the system of Greek numerals, it has a value of one. Alpha is derived from the Phoenician letter ''aleph'' , whose name comes from the West Semitic word for ' ...
strain.
In June 2021,
Reuters
Reuters ( ) is a news agency owned by Thomson Reuters. It employs around 2,500 journalists and 600 photojournalists in about 200 locations worldwide writing in 16 languages. Reuters is one of the largest news agencies in the world.
The agency ...
reported that more than 350 Indonesian doctors and medical workers out of 5,000 in
Kudus contracted the
Delta
Delta commonly refers to:
* Delta (letter) (Δ or δ), the fourth letter of the Greek alphabet
* D (NATO phonetic alphabet: "Delta"), the fourth letter in the Latin alphabet
* River delta, at a river mouth
* Delta Air Lines, a major US carrier ...
strain despite being vaccinated with the CoronaVac, an infection rate of 7%. In response,
Griffith University
Griffith University is a public university, public research university in South East Queensland on the Eastern states of Australia, east coast of Australia. The university was founded in 1971, but was not officially opened until 1975. Griffith ...
epidemiologist Dicky Budiman questioned the efficacy of CoronaVac against the variant but overall still recommended that people take the vaccine, expressing "confidence that to a certain degree Sinovac has effectiveness against the new variant". He stated that the situation was due to various factors, including a "lack of proper protective gear and the overall situation in Indonesia". The vast majority of those infected were protected from severe symptoms and recovered without hospitalization.
A Hong Kong 2022 study of the BA.2
Omicron variant comparing CoronaVac with
BNT162b2 (Pfizer) found effectiveness of 32.4% and 41.4% (respectively) in preventing infections with two doses, and 41.6% versus 50.9% (respectively) in preventing infections with three doses.
Another Hong Kong study of the BA.2 Omicron variant comparing CoronaVac with BNT162b2 for adults over age 60 found effectiveness of 69.9% versus 89.3% (respectively) in preventing severe disease or death with two doses, and 97.9% for both vaccines with three doses.
Authorizations
The
World Health Organization
The World Health Organization (WHO) is a list of specialized agencies of the United Nations, specialized agency of the United Nations which coordinates responses to international public health issues and emergencies. It is headquartered in Gen ...
(WHO) validated the Sinovac-CoronaVac COVID-19 vaccine for emergency use on 1 June 2021.
The recommendation was given with limited evidence at the time of approval for groups other than healthy adults. The WHO
Strategic Advisory Group of Experts expressed high level of confidence in the efficacy of the vaccine for adults, moderate confidence in the efficacy for older adults and individuals with comorbidities, moderate confidence in its safety for adults and low confidence in its safety for the elderly and individuals with comorbidities.
In late August 2020, China approved CoronaVac for emergency use to vaccinate high-risk groups such as medical staff. In early February, China approved CoronaVac for general use.
On 5 June 2021, China approved CoronaVac for emergency use with children and adolescents for 3–17 years old.
In January 2021, Bolivia authorized use of CoronaVac.
In April, Panama approved emergency use of Coronavac.
On 4 May, the EMA's human medicines committee (CHMP) started a rolling review of CoronaVac.
In June, Bangladesh approved Coronavac for emergency use.
Society and culture
Economics
As of 7 July 2021, CoronaVac is the most widely used COVID-19 vaccine in the world, with 943 million doses delivered globally.
In July, Sinovac signed advanced purchase agreements with
GAVI
GAVI, officially Gavi, the Vaccine Alliance (previously the GAVI Alliance, and before that the Global Alliance for Vaccines and Immunization) is a Public–private partnership, public–private global health partnership with the goal of incr ...
to supply
COVAX with 50 million doses in the third quarter of 2021 and up to a total of 380 million doses by the first half of 2022.
Asia
In January, Azerbaijan launched its vaccination campaign with CoronaVac.
It purchased 4 million doses from Turkey and 5 million doses from China.
In May, Armenia received 100,000 doses from China.
In February, Cambodia approved Coronavac for emergency use and started vaccinations in March. By July, the country had received 10.5 million doses.
In October, Saudi Arabia signed an agreement to distribute CoronaVac to 7,000 healthcare workers, after conducting Phase III trials with the
Saudi Arabian National Guard.
In November, Turkey signed a contract to buy 50 million doses of CoronaVac. Turkey approved emergency use on 13 January
and President
Recep Tayyip Erdoğan
Recep Tayyip Erdoğan (born 26 February 1954) is a Turkish politician who is the 12th and current president of Turkey since 2014. He previously served as the 25th prime minister of Turkey, prime minister from 2003 to 2014 as part of the Jus ...
received his first dose at Ankara City Hospital. In February, Turkey signed a deal for another 50 million doses for a total of 100 million doses.
By March 10.7 million doses had been administered, and 852 of the 1.3 million people who had received both doses were later diagnosed with the disease. 53 were hospitalized, but none of those hospitalized were intubated or died.
In December, Hong Kong ordered 7.5 million doses of CoronaVac. The vaccination campaign with CoronaVac began on 26 February.
By December 2020, Indonesia had signed agreements for 140 million doses of CoronaVac. Indonesia approved emergency use authorization on 11 January
and President
Joko Widodo
Joko Widodo (; born 21 June 1961), often known mononymously as Jokowi, is an Indonesian politician, engineer, and businessman who served as the seventh president of Indonesia from 2014 to 2024. Previously a member of the Indonesian Democratic ...
received the first shot of the vaccine.
By June, Indonesia had received 118.7 million bulk doses.
In January, Malaysia ordered 12 million doses
which was approved for emergency use in March. Science, Technology and Innovation Minister
Khairy Jamaluddin received the first dose as part of the vaccination campaign.
In March, Kazakhstan ordered 3 million doses, of which 500,000 doses arrived in June and has been approved for use by the Ministry of Health.
In May, Oman received its first batch of the vaccine.
In April, Pakistan granted emergency use authorization for CoronaVac
and received 14.5 million doses by July.
In January, the Philippines announced the country had secured 25 million doses. The vaccine was approved on 22 February but not for all health workers as it had lower efficacy when used with health workers compared to healthy individuals aged 18–59. The first 600,000 doses of CoronaVac arrived on 28 February, and the country had received 7.5 million doses by June.
Singapore signed advance purchase agreements for CoronaVac. In February, the first doses arrived and in June it was approved for use under the Special Access Route.
In May, Tajikistan's Ministry of Health announced it would receive 150,000 doses.
In February, Thailand approved emergency use and started its vaccination program on 27 February.
As of June, Thailand had received 10.5 million doses.
In May 2021, Georgia began vaccinations with CoronaVac, for which it received 1 million doses by July.
In May 2021, Turkmenistan received a delivery of CoronaVac.
In May 2021, AKIPress reported Uzbekistan plans to use CoronaVac.
In October 2021, Singapore included CoronaVac in its National Vaccination Programme for people aged 18 and over who are ineligible for
mRNA vaccines due to allergies or serious adverse reactions after the first dose.
Africa
In March, Benin received 203,000 doses of CoronaVac and started vaccinations on 29 March prioritizing healthcare workers, people over 60, and those with co-morbidities.
In April, Botswana received 200,000 doses of CoronaVac as a donation and purchased an additional 200,000 doses to be used in the vaccination program.
In March, Djibouti received 300,000 doses of CoronaVac.
In April, Egypt approved emergency use of CoronaVac.
In April, Guinea received 300,000 doses of CoronaVac which it had purchased.
In April, Libya received 150,000 doses of CoronaVac from Turkey.
In April, Somalia received 200,000 doses of CoronaVac.
In July, South Africa approved CoronaVac for emergency use, and was expected to receive 2.5 million doses shortly.
In April, Togo received 200,000 doses of CoronaVac.
In March, Tunisia's Ministry of Health approved marketing authorization for CoronaVac
and the first 200,000 doses arrived on 25 March.
In March, Zimbabwe approved emergency use and the first 1 million doses arrived on 30 March.
Europe
In March, Albania launched its vaccination campaign using mainly CoronaVac,
a week after securing 1 million doses from Turkey.
By June, Northern Cyprus received 190,000 doses donated by Turkey.
In March, Bosnia received 30,000 doses donated by Turkey.
In June, North Macedonia received 30,000 doses donated by Turkey
and another 500,000 doses it purchased.
In March, Ukraine granted approval for use of CoronaVac. Ukrainian Pharmaceutical Company Lekhim has an agreement to deliver 5 million doses.
1.7 million doses had been delivered by June.
In April, Moldova purchased 400,000 doses of CoronaVac.
South America
In Brazil, São Paulo governor
João Doria signed a $90 million contract with Sinovac in September to receive the initial 46 million doses of CoronaVac. The price for CoronaVac was announced to be US$10.3 (about R$59). In January, Brazil announced it would obtain 100 million total doses. On 17 January, Brazil's health regulatory agency
Anvisa approved emergency use of CoronaVac.
In early February, Brazil said it intends to buy an additional 30 million doses on top of existing 100 million doses.
A total of 39.7 million doses had been delivered by early April.
In October, Chile signed an agreement to purchase 20 million doses of CoronaVac which was approved for emergency use on 20 January. By early March, the country had received 10 million doses of CoronaVac and had vaccinated 4.1 million people.
In February, Colombia had purchased 5 million doses and was in talks for an additional 5 million doses, which had been approved for emergency use on 5 February.
In February, Ecuador signed a deal for 2 million doses which was approved for emergency use,
with the first 1 million doses arrived in early April.
In March, Paraguay received a donation of 20,000 doses from Chile.
Paraguay began vaccinations with CoronaVac on 10 March.
In January, Uruguay purchased 1.75 million doses, of which the first 192,000 doses arrived on 25 February and vaccinations started on 1 March.
North America
By June 2021, Dominican Republic had received 7.8 million doses of an order for 10 million doses.
In March 2021, El Salvador received 1 million doses of a total 2 million dose order for CoronaVac. The immunization campaign was initially focused on teachers, health professionals, firefighters, police, and military personnel. The first doses were provided to public school teachers beginning on March 30, with rollout expanding to private school teachers shortly after. Vaccination of the general public was planned for April 15, after the vaccination of the priority groups.
In February 2021, Mexico approved emergency use of CoronaVac. The country had ordered 20 million doses by March 2021, of which 7 million had been received by May.
Oceania
In March, Fiji said it would be receiving a donation of CoronaVac.
Controversies
China state media propaganda
In January 2021, as part of a
misinformation campaign, multiple Chinese state and CCP-affiliated media outlets, including CGTN and the ''
Global Times
The ''Global Times'' is a daily Chinese Tabloid (newspaper format), tabloid under the auspices of the Chinese Communist Party's flagship newspaper, the ''People's Daily'', commenting on international issues from a Chinese nationalistic pers ...
,'' have touted CoronaVac and Chinese vaccines as "relatively safer due to their mature technology". Pushing back against concerns of CoronaVac efficacy over the lack of transparency over releasing test results, China state media have raised doubts about the efficacy of the
Pfizer–BioNTech vaccine, calling for an investigation into the deaths of elderly people in Norway and Germany after receiving the vaccine. According to Reuters, the reports made allegations of "deliberately downplaying the deaths" and "using propaganda power to promote the Pfizer vaccine and smearing Chinese vaccines".
According to a ''Ming Pao'' report published on 21 March 2022, of the 1,486 who died of COVID-19 after receiving at least one dose, 1,292 of them or 87%—had gotten the Sinovac vaccine. The Centre for Health Protection's Chuang Shuk-kwan said that the ''Ming Pao'' report was inaccurate and has defended CorovaVac, saying "The issue is not about which jab offers more protection. The most important thing is whether you get vaccinated." Earlier in February 2022, health authorities refused to disclose data on which COVID-19 vaccine had been taken by Omicron patients, claiming the information "was not readily available." Hong Kong government data showed CoronaVac to be the preferred vaccine among those aged 70 and over, in part because some elderly care homes only offer this vaccine. However, CoronaVac's limited effectiveness compared to the BioNTech vaccine, along with the zero-COVID strategy, have been regarded as factors behind Hong Kong's spiking cases as of March 2022.
Politicization
CoronaVac has been championed by the governor of
São Paulo
São Paulo (; ; Portuguese for 'Paul the Apostle, Saint Paul') is the capital of the São Paulo (state), state of São Paulo, as well as the List of cities in Brazil by population, most populous city in Brazil, the List of largest cities in the ...
,
João Doria.
A political showdown began in October 2020, when Bolsonaro vetoed a deal between the Brazilian health ministry and the São Paulo government for the purchase of 46 million doses of the vaccine.
After Instituto Butantan announced CoronaVac's efficacy rate, Bolsonaro mocked the vaccine's effectiveness against COVID-19.
In March 2021, the Paraná Pesquisas opinion polling institute found that the vaccines preferred by Brazilians are CoronaVac and the
Oxford–AstraZeneca vaccine, chosen by 23.6% and 21.2% of Brazilians interviewed, respectively, against 11.3% of those who would prefer the
Pfizer–BioNTech vaccine. During the
pandemic parliamentary inquiry in Brazil, senators have expressed that anti-China rhetoric has contributed to delaying access to vaccines in Brazil.
Delays in releasing results
On 23 December 2020, researchers in Brazil said the vaccine was more than 50% effective, but withheld full results at Sinovac's request, raising questions about transparency as it was the third delay in releasing results from the trials.
Scientists said the lack of transparency risked damaging CoronaVac's credibility.
U.S. disinformation campaign
References
Further reading
*
*
*
External links
Clinical Research Protocol for CoronaVac Phase III Trials in Brazil*
*
*
*
{{DEFAULTSORT:Coronavac
Chinese COVID-19 vaccines
Inactivated vaccines
Products introduced in 2020