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*12 serotypes causing the same disease
 
*12 serotypes causing the same disease
 
*Different serotypes in different regions, with serotypes 3,6 and 8 the most common in the UK
 
*Different serotypes in different regions, with serotypes 3,6 and 8 the most common in the UK
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*Acute disease in susceptible herds with high morbidity and mortality
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*Carrier herds have some immunity, protecting from acute disease, where lesions are often subclinical, and deaths sporadic
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*Lung scarring and pleural adhesions in many recovered animals
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*Solid immunity develops in recovered animals to all serotypes
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