[Prevalence of lysotype No. 3 of Salmonella paratyphi A in Peru]

Sixty-nine S. paratyphi A strains isolated from Peru were studied with the aid of the phage-typing system of Banker. 55 strains (79.7%) showed specific lytic reactions of the phage-type no 3 and 12 strains (17.3%) those of the phage-type no 1; one strain was atypical and another untypable. All of these strains were susceptible to ampicillin, chloramphenicol, streptomycin, tetracycline and trimethoprim. These results are compared with the data of the scientific literature on the worldwide distribution of the S. paratyphi A phage-types.