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==History and Clinical Signs==
==History and Clinical Signs==
In ruminants listeriosis is seen as meningoencephalitis, in monogastric animals and young ruminants it causes a septicaemia. If animals are infected whilst pregnant this can cause abortion. Following abortion the animal normally recovers.
In ruminants listeriosis is seen as affects the nervous system causing a meningoencephalitis. in monogastric animals and young ruminants it causes a septicaemia. If animals are infected whilst pregnant this can cause abortion. Following abortion however the animal will recover normally.
Listeriosis can also manifest as conjunctivitis, pneumonia, myocarditis and endocarditis.
Listeriosis can also manifest as conjunctivitis, pneumonia, myocarditis and endocarditis.
*Neural listeriosis:
**Incubation period 14-40 days
**Meningoencephalitis
**Dullness, circling, head tilt, facial paralysis, drool saliva, droop of eyelid and ear
**Exposure keratitis
**Fever during early stages
**Recumbency and death within a few days in sheep and goats
**Abortion up to 12 days after infection in cattle; usually recover but may get septicaemia
*Septicaemic listeriosis:
**Incubation period 2-3 days
**Lambs and occasionally pregnant sheep
**Occurs in newborn piglets, foals, poultry, adult sheep
*Keratoconjunctivitis in cattle and sheep - direct contact with silage via eye
*Pneumonia, myocarditis, enodcarditis
==Pathology==
==Pathology==
Causes abortions in cattle and sheep last third of pregnancy. Foetal membranes often retained leading to metritis. The placenta is covered by purulent exudate and there are focal pinpoint yellow lesions in foetal liver.
Causes abortions in cattle and sheep last third of pregnancy. Foetal membranes often retained leading to metritis. The placenta is covered by purulent exudate and there are focal pinpoint yellow lesions in foetal liver.
*Zoonosis - consumption of contaminated unpasteurised milk; memingitis and meningoencephalitis; abortion
*Zoonosis - consumption of contaminated unpasteurised milk; memingitis and meningoencephalitis; abortion