Toroviruses are a group of viruses similar to the coronaviruses, but with a characteristic rod or doughnut-shaped core. They include Berne virus, isolated from a horse, Breda virus isolated from cattle, and several torovirus-like isolates from humans.

Recently, torovirus-like particles and antibody reacting with Breda virus types 1 and 2 have also been detected in cats.

Although not reproduced experimentally, there is some evidence to link this virus in cats to a clinical syndrome involving persistent diarrhoea and protrusion of the nictitating membrane.

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