When phage P22 propagated on and on was allowed to act on a non-motile strain of B, llserologically differentstrains resulted. Five were named serotypes (2 motile B; 2 ; one ). The remaining 6 were unnamed serotypes. Seven of these transductions were done in chick embryos and 4 in mice. It would seem likely that transductions can occur naturally in man and other animals and may, at least in part, be responsible for the 50 or so new salmonellae reported each year. It is therefore suggested that the recommendation of the Enterobacteriaceae Subcommittee of 1954 for the classification by antigenic formula rather than by name of Salmonellae isolated in future be preferred to the reverse recommendation of the same Subcommittee in 1955.


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