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Epidemiological analysis of salmonella typhimurium infections on the basis of laboratory methods 1. distribution of phage types and biotypes of salmonella typhimurium isolated in hungary in the period 1960 1981

, : Epidemiological analysis of salmonella typhimurium infections on the basis of laboratory methods 1. distribution of phage types and biotypes of salmonella typhimurium isolated in hungary in the period 1960 1981. Acta Microbiologica Hungarica 32(1): 75-86

Phage and biochemical types of 34,937 S. typhimurium cultures (31,708 human strains, 2732 animal strains and 497 strains isolated from water) were determined. Phage type 4, nontypable strains (nt) and phage type 2b were predominant among the strains of human and animal origin, and nt, 4 and 2b among the strains isolated from water. The most frequent phage types and the nt strains were subdivided by biotyping and additional phages. The incidence of S. typhimurium var. copenhagen strains was 12.4%; they belonged mainly to phage types 2b and nt. The number of S. typhimurium isolates of human origin showed a 2-4 yr periodic fluctuation between 1960-1981. A connection was found between the incidence of the predominant phage types (4, nt, 2b) and the periodic changes in the total number of isolates. Phage type 4, which predominated among the strains of human and animal origin till 1976, was displaced gradually by nt ones. In the period when the change in predominance was observed the number of epidemics decreased and the number of sporadic cases increased. The change in the frequency of phage types took place at the same time when the frequency of phage types changed among the strains isolated from cattle and meat-products (4 .fwdarw. nt). The increased number of sporadic cases after 1976 refers to infections from cattle and not from poultry.

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