Changes

**Fever, general malaise, repsiratory and abdominal signs, lameness, paralysis or convulsions

**Fever, general malaise, repsiratory and abdominal signs, lameness, paralysis or convulsions

**Sporadic outbreaks in the UK

**Sporadic outbreaks in the UK

*Morbidity and mortality often low due to widespread acquired resistance

**Morbidity and mortality often low due to widespread acquired resistance

**Mortality up to 50% in some outbreaks e.g. specific pathogen-free herds

**Mortality up to 50% in some outbreaks e.g. specific pathogen-free herds

**Can be fatal in 2-5 days

**Can be fatal in 2-5 days