Changes

==History and Clinical Signs==

==History and Clinical Signs==

In ruminants listeriosis affects the nervous system causing a meningoencephalitis. Animals present dull, sometimes with a head tilt, facial paralysis, a drooping eyelid and often circling. In monogastric animals and young ruminants listeriosis causes septicaemia.  

The most recognised form of listeriosis in ruminants affects the nervous system causing meningoencephalitis. Animals present depressed, sometimes with a head tilt, facial paralysis, a drooping eyelid and often circling. This can lead to recumbency and death within 24-48 hours. In monogastric animals and young ruminants listeriosis causes septicaemia.  

If animals are infected whilst pregnant this can cause abortion up to 12 days later. Following abortion the animal will often recover normally unless the foetus is retained when septicaemia will follow.

If animals are infected whilst pregnant this can cause abortion up to 12 days later. Following abortion the animal will often recover normally unless the foetus is retained when septicaemia will follow.

Listeriosis can also manifest as conjunctivitis when infected silage come in contact with the animals eye, pneumonia, myocarditis and endocarditis.

Listeriosis can also manifest as conjunctivitis when infected silage come in contact with the animals eye, pneumonia, myocarditis and endocarditis.

**Incubation period 14-40 days

**Incubation period 14-40 days

 

**Fever during early stages

**Fever during early stages

**Recumbency and death within a few days in sheep and goats

**Recumbency and death within a few days in sheep and goats