Onset usually 5-10 weeks of age (nursery/grower). Peracute - dead in good condition. Acute: fever > 40, septicemia, recumbency, convulsions, paddling, dog-sitting, polyserositis/arthritis, meningitis, +/- pneumonia. Infarcts of peripheral tissues. Chronic: arthritis, valvular endocarditis (cyanosis), bronchopneumonia, pleural adhesions
