The position of the two types of organisms found in Wakefield by Berger is discussed. One of the types was found to be identical with two strains labeled elsewhere as Proteus morgani.

The heat-labile antigen we had found in the organisms of Berger and in Shigella Large-Sachs Q454 is also present in a colon strain obtained from England. Reactivity with this heat-labile antigen of sera of normal rabbits is very rare in rabbits obtained in this neighborhood, and it appears unlikely that “normal” antibodies are an important source of error in this connection.

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This article is a note submitted by the authors as an extension of a paper published in volume 53 of this journal.

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