• Infection is widespread in the cat population: a survey has shown that over 70% of 126 cats sampled were seropositive to B. bronchiseptica and the organism was isolated from approximately 5% of 527 cats tested. Infection appeared to be more common in multi-cat households with a history of respiratory disease.
• Some seropositive animals appear to be long-term carriers of the organism.
• Criteria for cat-to-cat transmission is not yet established - some animals may shed higher levels of the bacterium and be of greater epidemiological significance
• Inter-species transmission may be a possibility, e.g. between dogs and cats.

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