Six strains of Gram-negative non-motile bacilli from cats have been described. They do not grow on ordinary media. They do grow, however, on a medium to which an autoclave-labile substance alone has been added as an accessory growth factor. These bacilli are similar to Bacillus parainfluenzaæisolated from man. One strain of a Gram-negative non-motile bacillus more exacting than Bacillus influenzæ in its food requirements was found and for convenience has been placed for the present in the parainfluenza group.

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