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Six different Salmonella group A phages from salmonellae in Kauffmann- White groups B, C(1), C(2), and D were examined serologically. Those phages which were specific for a particular somatic antigen were found to be serologically very similar. Antiserum against a phage with one specificity was able to neutralize a different phage with the same specificity but unable to neutralize, in the normal way, a phage with a different specificity. Phages mixed with heterologous phage antiserum responded with an "inhibition response" in which there appeared to be a neutralization of the phage infectivity for the first 10 min, followed by a reversal of the neutralization until, by 20 or 25 min, there was no apparent neutralization. This response was interpreted to indicate that the adsorption antigens, probably situated on the tail fibers, were different for phages with different specificities but sufficiently similar so that heterologous antibodies could react with the antigens; but the antigen-antibody complex was quickly disassociated, resulting in a modification of the antibody molecules but no change in the specificity sites of the antigen. A subgrouping of the Salmonella A phages based on their antigenic specificity is suggested.

Serological Relationships of Salmonella A Bacteriophages Isolated from Salmonellae in Different Kauffmann- White Groups