Carlos Juan Finlay (December 3, 1833 – August 20, 1915) was a Cuban
epidemiologist
Epidemiology is the study and analysis of the distribution (who, when, and where), patterns and determinants of health and disease conditions in a defined population, and application of this knowledge to prevent diseases.
It is a cornerstone ...
recognized as a pioneer in the research of
yellow fever, determining that it was transmitted through mosquitoes ''
Aedes aegypti
''Aedes aegypti'' ( or from Greek 'hateful' and from Latin, meaning 'of Egypt'), sometimes called the Egyptian mosquito, dengue mosquito or yellow fever mosquito, is a mosquito that spreads diseases like dengue fever, yellow fever, malar ...
''.
Biography
Early life and education
Finlay was born Juan Carlos Finlay y de Barrés in
Puerto Príncipe (now Camagüey), Cuba to Scottish-born Dr. Edward (Eduardo) Finlay and French-born Elisa (Isabel) de Barrés.
At that time Cuba was part of the Kingdom of Spain. He reversed the order of his given names to "Carlos Juan" later in his life. His father was a physician who had fought alongside
Simón Bolívar
Simón José Antonio de la Santísima Trinidad Bolívar y Palacios (24July 178317December 1830) was a Venezuelan statesman and military officer who led what are currently the countries of Colombia, Venezuela, Ecuador, Peru, Panama, and Bol ...
, and his family owned a coffee plantation in
Alquízar. He attended school in France in 1844, but was forced to return to Cuba after two years because he contracted
chorea
Chorea, or (rarely) choreia, () is an abnormal involuntary movement disorder, characterized by quick movements of the hands or feet. It is one of a group of neurological disorders called dyskinesias. The term ''chorea'' is derived , as the move ...
.
After recovering, he returned to Europe in 1848, but became stuck in England for another two years due to political turmoil, and after arriving in France to continue his education, he contracted
typhoid fever
Typhoid fever, also known simply as typhoid, is a disease caused by '' Salmonella enterica'' serotype Typhi bacteria, also called ''Salmonella'' Typhi. Symptoms vary from mild to severe, and usually begin six to 30 days after exposure. Often th ...
and again returned to Cuba.
Because the University of Havana would not recognize his European academic credits, he enrolled at
Jefferson Medical College
Thomas Jefferson University is a private research university in Philadelphia, Pennsylvania, United States. Established in its earliest form in 1824, the university officially combined with Philadelphia University in 2017. The university is ...
in
Philadelphia, Pennsylvania
Philadelphia ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the Unit ...
, which did not require prerequisites. Here Finlay met
John Kearsley Mitchell, a proponent of the
germ theory of disease
The germ theory of disease is the currently accepted scientific theory for many diseases. It states that microorganisms known as pathogens or "germs" can cause disease. These small organisms, which are too small to be seen without magnification, ...
, and his son
Silas Weir Mitchell, who supervised his studies. He graduated from Jefferson Medical College in 1855.
He then returned to
Havana
Havana (; ) is the capital and largest city of Cuba. The heart of La Habana Province, Havana is the country's main port and commercial center.[Paris
Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...](_bl ...<br></span></div> and set up an ophthalmology practice in 1857, and then studied in <div class=)
in 1860–61. In October 1865 he married Adela Shine, a native of the
Island of Trinidad. They had three sons, Charles, George and Frank Finlay.
Professional career
Finlay's work, carried out during the 1870s, finally came to prominence in 1900. He was the first to theorize, in 1881, that a mosquito was a carrier, now known as a disease
vector
Vector most often refers to:
* Euclidean vector, a quantity with a magnitude and a direction
* Disease vector, an agent that carries and transmits an infectious pathogen into another living organism
Vector may also refer to:
Mathematics a ...
, of the organism causing
yellow fever: a mosquito that bites a victim of the disease could subsequently bite and thereby infect a healthy person.
He presented this theory at the 1881
International Sanitary Conference, where it was not well-received, and in fact made him subject to ridicule and mockery.
[ Crosby, M.C. 2006. The American Plague: The Untold Story of Yellow Fever, The Epidemic That Shaped Our History. ]Berkley Books
Berkley Books is an American imprint founded in 1955 by Charles Byrne and Frederic Klein owned by the Penguin Group unit of Penguin Random House.
History
Berkley Books began as an independent company in 1955. It was founded as "Chic News Compa ...
. A year later Finlay identified a mosquito of the
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
''
Aedes
''Aedes'' (also known as the tiger mosquito) is a genus of mosquitoes originally found in tropical and subtropical zones, but now found on all continents except Antarctica. Some species have been spread by human activity: ''Aedes albopictus'', ...
'' as the organism transmitting yellow fever.
His theory was followed by the recommendation to control the mosquito population as a way to control the spread of the disease.
His hypothesis and exhaustive proofs were confirmed nearly twenty years later by the
Walter Reed Commission of 1900. Finlay went on to become the chief health officer of Cuba from 1902 to 1909. Although Reed received much of the credit in history books for "beating" yellow fever, Reed himself credited Finlay with the discovery of the yellow fever vector, and thus how it might be controlled. Reed often cited Finlay's papers in his own articles and gave him credit for the discovery in his personal correspondence.
[Pierce J.R., J, Writer. 2005. Yellow Jack: How Yellow Fever Ravaged America and Walter Reed Discovered its Deadly Secrets. John Wiley and Sons. ]

In the words of General
Leonard Wood
Leonard Wood (October 9, 1860 – August 7, 1927) was a United States Army major general, physician, and public official. He served as the Chief of Staff of the United States Army, List of colonial governors of Cuba, Military Governor of Cuba, ...
, a physician and
U.S.
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 states and a federal capital district, Washington, D.C. The 48 contiguous ...
military governor of Cuba in 1900: "The confirmation of Dr. Finlay's doctrine is the greatest step forward made in medical science since
Jenner's discovery of the vaccination
or smallpox">smallpox.html" ;"title="or smallpox">or smallpox"
This discovery helped William C. Gorgas reduce the incidence and prevalence of mosquito-borne diseases in Panama during the American campaign, from 1903 onwards, to construct the Panama Canal. Prior to this, about 10% of the workforce had died each year from
malaria
Malaria is a Mosquito-borne disease, mosquito-borne infectious disease that affects vertebrates and ''Anopheles'' mosquitoes. Human malaria causes Signs and symptoms, symptoms that typically include fever, Fatigue (medical), fatigue, vomitin ...
and yellow fever.
Finlay was a member of Havana's Royal Academy of Medical, Physical and Natural Sciences. He was fluent in
French,
German,
Spanish, and
English and could read
Latin
Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
. His interests were widespread and he wrote articles on subjects as varied as
leprosy
Leprosy, also known as Hansen's disease (HD), is a Chronic condition, long-term infection by the bacteria ''Mycobacterium leprae'' or ''Mycobacterium lepromatosis''. Infection can lead to damage of the Peripheral nervous system, nerves, respir ...
,
cholera
Cholera () is an infection of the small intestine by some Strain (biology), strains of the Bacteria, bacterium ''Vibrio cholerae''. Symptoms may range from none, to mild, to severe. The classic symptom is large amounts of watery diarrhea last ...
,
gravity
In physics, gravity (), also known as gravitation or a gravitational interaction, is a fundamental interaction, a mutual attraction between all massive particles. On Earth, gravity takes a slightly different meaning: the observed force b ...
, and
plant diseases. His main interest, however, was yellow fever, and he was the author of 40 articles on this disease. His theory that an intermediary host was responsible for the spread of the disease was treated with ridicule for years. A humane man, he often took on patients who could not afford medical care. As a result of his work, Finlay was nominated seven times for the
Nobel Prize in Physiology or Medicine
The Nobel Prize in Physiology or Medicine () is awarded yearly by the Nobel Assembly at the Karolinska Institute for outstanding discoveries in physiology or medicine. The Nobel Prize is not a single prize, but five separate prizes that, acco ...
, although he was never awarded the prize.
[ Crosby, M.C. 2006. The American Plague: The Untold Story of Yellow Fever, The Epidemic That Shaped Our History. ]Berkley Books
Berkley Books is an American imprint founded in 1955 by Charles Byrne and Frederic Klein owned by the Penguin Group unit of Penguin Random House.
History
Berkley Books began as an independent company in 1955. It was founded as "Chic News Compa ...
. He received the National Order of the
Legion of Honour
The National Order of the Legion of Honour ( ), formerly the Imperial Order of the Legion of Honour (), is the highest and most prestigious French national order of merit, both military and Civil society, civil. Currently consisting of five cl ...
of France in 1908.

Finlay died from a
stroke
Stroke is a medical condition in which poor cerebral circulation, blood flow to a part of the brain causes cell death. There are two main types of stroke: brain ischemia, ischemic, due to lack of blood flow, and intracranial hemorrhage, hemor ...
, caused by severe brain seizures, at his house in Havana on August 20, 1915.
Legacy
In 1928, President
Gerardo Machado established the National Order of Merit Carlos J. Finlay, rewarding contributions to healthcare and medicine. It is the highest scientific decoration awarded by the
Cuban Council of State. The order was discontinued between 1959 and 1981.
In recognition of his work on Yellow Fever,
The American Society of Tropical Medicine & Hygiene posthumously awarded him the
Walter Reed Medal in 1942.
On Cuba Street in downtown
Old Havana, the Revolutionary Government in 1962 founded a medical history museum in honor of Carlos J. Finlay. On the wall of the Finlay Medical History Museum in Havana, the inscription states, "History Museum of the Medical Sciences ' Carlos J. Finlay', created by the Revolutionary Government in eternal homage to the men who contributed to the advance of the sciences in Cuba. National Commission of the Academy of Sciences of the Republic of Cuba. Havana, 13 June 1962."
In the municipality of
Marianao, now within the city of
Havana
Havana (; ) is the capital and largest city of Cuba. The heart of La Habana Province, Havana is the country's main port and commercial center.[Panama City
Panama City, also known as Panama, is the capital and largest city of Panama. It has a total population of 1,086,990, with over 2,100,000 in its metropolitan area. The city is located at the Pacific Ocean, Pacific entrance of the Panama Canal, i ...](_bl ...<br></span></div>, there is a monument in the shape of a syringe, honoring Finlay and usually referred to as ''El Obelisco'' (''The Obelisk''). Finlay was also commemorated on a 1981 Cuban stamp. A statue commemorating Finlay is located on the bayfront in <div class=)
, near the canal he helped make possible.
The
UNESCO
The United Nations Educational, Scientific and Cultural Organization (UNESCO ) is a List of specialized agencies of the United Nations, specialized agency of the United Nations (UN) with the aim of promoting world peace and International secur ...
Carlos J. Finlay Prize for Microbiology is named in his honor.
Finlay was honoured with a
Google Doodle on December 3, 2013, on the 180th anniversary of his birth.
Carlos J. Finlay Military Hospital is named after him. The
Finlay Institute for Vaccines (Instituto Finlay de Vacunas, in Spanish), created in 1991, is named after him, as is the exoplanet
BD−17 63 b in
Cetus
Cetus () is a constellation, sometimes called 'the whale' in English. The Cetus (mythology), Cetus was a sea monster in Greek mythology which both Perseus and Heracles needed to slay. Cetus is in the region of the sky that contains other water- ...
.
Miami-Dade County Public Schools
Miami-Dade County Public Schools (M-DCPS) is the public school district serving Miami-Dade County, Florida, Miami-Dade County in the U.S. state of Florida. Founded in 1885, it is the largest school district in Florida, the largest in the South ...
operates Dr. Carlos J. Finlay Elementary School on the campus of
Florida International University
Florida International University (FIU) is a public research university with its main campus in Westchester, Florida, United States. Founded in 1965 by the Florida Legislature, the school opened to students in 1972. FIU is the third-largest univ ...
, in
Westchester, Florida (formerly in the
University Park census-designated place
A census-designated place (CDP) is a Place (United States Census Bureau), concentration of population defined by the United States Census Bureau for statistical purposes only.
CDPs have been used in each decennial census since 1980 as the counte ...
).
Compare the address with the following:
*
*
*
Despite the "Miami, FL" postal address, it is not in the City of Miami
see map of Miami-Dade County municipalities
"The U.S. Postal Service establishes ZIP codes and mailing addresses in order to maximize the efficiency of their system, not to recognize jurisdictional boundaries."
See also
*
Healthcare in Cuba
*
Health measures during the construction of the Panama Canal
Footnotes
References
*
* bkfa
*
*
*
*
* Pierce J.R., J, Writer. 2005. Yellow Jack: How Yellow Fever Ravaged America and Walter Reed Discovered its Deadly Secrets. John Wiley and Sons.
* Crosby, M.C. 2006. The American Plague: The Untold Story of Yellow Fever, The Epidemic That Shaped Our History. Berkley Books.
* Jefferson Medical College hosted an international symposium celebrating accomplishments of Dr. Carlos Finla
Yellow Fever, A Symposium in Commemoration of Carlos Juan Finlay 1955.
External links
Carlos Juan Finlay article from Encyclopedia of World BiographyCarlos J. Finlay article from Encyclopaedia BritannicaCarlos Juan Finlay article from The American Academy of Ophthalmology
{{DEFAULTSORT:Finlay, Carlos
Yellow fever
1833 births
1915 deaths
Cuban physicians
Epidemiologists
19th-century Cuban people
People from Camagüey
Jefferson Medical College alumni
Cuban ophthalmologists