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Glaesserella Parasuis
''Glaesserella parasuis'' (formerly known as ''Haemophilus parasuis'') is a Gram-negative bacterium belonging to the family Pasteurellaceae. It is best known as the causative agent of Glässer's disease in pigs. History and taxonomy Originally described as ''Haemophilus parasuis'' by Biberstein and White in 1969, it was reclassified into the newly created genus ''Glaesserella'' in 2020 based on comprehensive phylogenomic analyses. Morphology ''Glaesserella parasuis'' is a Gram-negative coccobacillus. Cells typically appear as short rods or coccobacilli, often forming pairs or short chains. It is non-motile and non-spore-forming. Growth conditions The bacterium requires enriched media containing NAD (V factor) and exhibits optimal growth under aerobic conditions at 37 °C. Colonies typically appear small, smooth, and translucent on chocolate agar or blood agar supplemented with NAD. Clinical significance ''Glaesserella parasuis'' is the causative agent of Gl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gram-negative
Gram-negative bacteria are bacteria that, unlike gram-positive bacteria, do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. Their defining characteristic is that their cell envelope consists of a thin peptidoglycan cell wall sandwiched between an inner ( cytoplasmic) membrane and an outer membrane. These bacteria are found in all environments that support life on Earth. Within this category, notable species include the model organism '' Escherichia coli'', along with various pathogenic bacteria, such as '' Pseudomonas aeruginosa'', '' Chlamydia trachomatis'', and '' Yersinia pestis''. They pose significant challenges in the medical field due to their outer membrane, which acts as a protective barrier against numerous antibiotics (including penicillin), detergents that would normally damage the inner cell membrane, and the antimicrobial enzyme lysozyme produced by animals as part of their innate immune system. Furthe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
