462
edits
Changes
no edit summary
*Carried by sheep and goats and shed in faeces and milk especially during stress
*Carried by sheep and goats and shed in faeces and milk especially during stress
*Can cause septicaemia, encephalitis and abortion
*Can cause septicaemia, encephalitis and abortion
*Outbreaks of listeriosis often linked to silage feeding
*''L. ivanovii produces strong haemolytic zone
*''L. ivanovii produces strong haemolytic zone
*Small, smooth, transparent colonies after 24 hours incubation
*Small, smooth, transparent colonies after 24 hours incubation
*Grow on non-enriched media
*Transplacental transmission in pregnant animals
*Transplacental transmission in pregnant animals
*Bacteria may gain entry via breaks in oral or nasal mucosa, migrate in cranial nerves to cause neural signs
*Bacteria may gain entry via breaks in oral or nasal mucosa, migrate in cranial nerves to cause neural signs
*Causes formation of microabscesses and perivascular lymphocytic cuffs in brainstem
*''L. monocytogenes'' can replicate within phagocytic and non-phagocytic cell, and pass between cells without being exposed to the immune system
*Surface proteins known as internalins allow adherence and uptake of the bacteria into cells
*Listeriolysin produced by virulent strains destroys membranes of phagocytic vacuoles, releasing the bacteria into the cytoplasm
*Listeria are motile in the cytoplasm
*Bacteria induce formation of pseudopod projections in the cytoplasmic membrane, which are taken up with the bacteria into adjacent cells
===Clinical infections===