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The conjugative plasmids determining sulfonamide resistance in fiveShigella strains, each isolated from a different patient, have been characterized. OneS. flexneri 2a strain, isolated in 1952, harbored an fi+ plasmid of molecular weight 53 × 106 , which specified synthesis of F-like pili and bore determinants for sulfonamide resistance (Su) and bacteriocinogeny (Col). This plasmid was compatible with plasmids of groups FI , FII , Iα , and P. A secondS. flexneri 2a strain isolated in 1952 harbored an fi− plasmid of molecular weight 59 × 106 , bearing the Su determinant and compatible with all plasmids tested. This strain also harbored an fi+ group-FII plasmid of molecular weight 42 × 106 , which bore the Col determinant and specified synthesis of F-like pili. ThreeS. dysenteriae 2 strains isolated in 1956 carried apparently identical fi− plasmids of molecular weight 58 × 106 , which bore the Su determinant, could form transconjugants inPseudomonas but not inProteus , and were incompatible with the P-group plasmid RP4.

Genetic and Biophysical Study of R Plasmids Conferring Sulfonamide Resistance in Shigella Strains Isolated in 1952 and 1956