Abstract
IT is generally appreciated that a lung infection of adult rats is common to most laboratory rat colonies, and it is not unusual for up to 75 per cent of a colony to be infected. In recent years the disease has been given various names, but it is usually described now as a pleuro-pneumonia-like organism infection. This merely means that it is an infectious catarrh caused by these organisms. However, no specific organisms have been isolated which could be held responsible for the disease. Normally the infection only appears in the older rats, but the very young animals may also succumb to it, probably being infected by their mothers.
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