The Reaction of Antisera for B. actinoides

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Abstract
Suspensions of Bacillus actinoides of bovine origin and of its rodent variety made from washed and desiccated cells were sufficiently stable for agglutinative purposes. A rabbit antiserum for the rodent organism agglutinated a suspension of the homologous variety through a dilution of 1:3200 and of the heterologous variety through a dilution of 1:400. An antiserum for the bovine form agglutinated both suspensions through a dilution of 1:800. The bearing of these findings on the relationship of the 2 organisms is considered. Both showed atypical growth in homologous antiserum at the base of slanted agar, characterized by predominance of spherical bodies. Cultures in heterologous antiserum showed only an occasional group of similar forms. The nature of this degenerative reaction is discussed.

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