Grams to the original J~~~~~~~ cultures were found in collections from Brazil, Burma, such isolates might be of limited tropical or sub- from these areas was not sufficient, however, ~~443, ~~445, ~ ~338, ~~339, ~~446, ~~617, to verify this observation. Additional results in- CS22127, CS619, CS863. California, 1968: T29. dicated that, in two locations, cultures collected California, 1970 702596. California, 1971: 715037, varieties and subspecies of the Y. pestis-Y. pestoides complex were found. We have, there- fore, examined the Y. pestis-Y. pestoides com- plex with the view of describing the major quan- titative protein variants present in the sample, as well as the geographic distribution of such variants. T"yU,"m"k~~~~7~~ -~~~~-2.