Changes

Listeria are intracellular pathogens. They are Gram positive rods with catalase positive and oxidase negative activity. They are facultative anaerobes and have tumbling motility.

Listeria are intracellular pathogens. They are Gram positive rods with catalase positive and oxidase negative activity. They are facultative anaerobes and have tumbling motility.

[[Listeria monocytogenes|L.monocytogenes]] is haemolytic on blood agar due to a cytolytic protein, listeriolysin, and grows at range of pH values and temperatures.[[Listeria ivanovii|L.ivanovii]] produces a strong haemolytic zone. Listeria produces small, smooth, transparent colonies after 24 hours incubation. They are able to grow on non-enriched media.

[[Listeria monocytogenes|L.monocytogenes]] is haemolytic on blood agar due to a cytolytic protein, listeriolysin, and grows at range of pH values and temperatures. [[Listeria ivanovii|L.ivanovii]] produces a strong haemolytic zone. Listeria produces small, smooth, transparent colonies after 24 hours incubation. They are able to grow on non-enriched media.

==Pathogenesis and pathogenicity==

==Pathogenesis and pathogenicity==