Genus Listeria

“Silage disease”

Epidemiology

● Contaminated silage is the classical source called ?

Septicemia, abortion, meningoencephalitis

Main manifestation of L. monocytogenes: ?, ?, ?

Meningoencephalitis

When an animal with Listeria is opened, there is softening of the brain — medulla oblongata and pons

Circling Disease

● Animal walk in circles

● Affected brain stem — medulla oblongata, pons

● Stress factors predispose to clinical disease

Listeria infection

● Induce an increase in neutrophils

● Release monocytosis producing agent

Common leukogram is monocytosis rather than neutrophilia

Listeria monocytogenes

?

– Surrounded by halo (Oxoid Agar)

– Narrow zone of hemolysis B

Listeria ivanovii

?

– Double, bizonal hemolysis (BAP)

➢ Inner beta, outer alpha hemolysis