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Abstract
Calf diarrhoea is an important cause of economic loss. The aetiology of the disease
is considered with particular reference to the role of viruses. Although many microbial
organisms have been associated with the disease, there is doubt concerning their true
role as causative agents. Two viruses, neonatal calf diarrhoea reovirus-life agent
and calf coronavirus, have been discovered recently which appear to play an important
role in many cases of diarrhoea and the evidence for considering them to be primary
causes of the disease is discussed.