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Epidemiological analysis of salmonella typhimurium infections on the basis of laboratory methods 2. resistance to antibiotics and r plasmid carrier state in salmonella typhimurium isolated in hungary in the period 1974 1981

, : Epidemiological analysis of salmonella typhimurium infections on the basis of laboratory methods 2. resistance to antibiotics and r plasmid carrier state in salmonella typhimurium isolated in hungary in the period 1974 1981. Acta Microbiologica Hungarica 32(1): 87-98

Phage and biochemical typing of S. typhimurium strains performed during the Salmonella Surveillance Program were accompanied by examinations on resistance to antibiotics and R-plasmids (R-p). A total of 15,600 strains of human, animal and water origin were tested between 1975-1981. Most of the monoresistant strains were found among the animal strains (73.6-94.9%), while double resistance was the most frequent among the human strains (5.5-25.5%) and multiresistance occurred in the highest ratio (2.8-25.6%) among the strains of water origin. Tetracycline resistance was the most common in all 3 sources. The curves representing the incidence of tetracycline (Tc), chloramphenicol (Cm), streptomycin (Sm) and kanamycin (Km) resistance were similar to the curve of multiple resistance and differed from the curve showing the incidence of ampicillin (Ap) resistance. Gentamicin resistance was found only among human strains (in 0.3 and 0.7%); strains resistant to nitro-furantoin and co-trimoxazole occurred among strains of human and water origin in low percentages. The most common antibiotic resistance patterns of the mutiple resistant strains were Tc, Cm, Sm, Km, Ap sulfonamide (Su); Tc, Sm, Su; Sm, Km, Ap, Su. Most multiple resistant strains belonged to phage type nt (not typable) and 2b. Of the examined 512 S. typhimurium strains resistant to antibiotics, the presence of R-p was demonstrated in 408 strains (79.7%). The R-p, derived from strains of human, animal and water origin, of phage type nt, biotype 3 (nt/3) isolated in 1979, were characterized according to resistance determinants, fi-character, incompatibility group, phage inhibition and MW. Two kinds of R-p were carried by 3 human strains (FI, H and FI, .alpha.). R-p belonging to IncP and IncH were carried by 1 animal strain. Strains isolated from sewage carried R-p of Inc groups H and I.alpha. Of the examined 15 S. typhi murium strains of phage type 2b, isolated in 1981, the MW for 7 strains was 66 megadaltons and 4 belonged to IncI.alpha. The R-p derived from 2b/2 strains, isolated in the same county, were identical according to antibiotic resistance determinants, phage inhibition and MW. The MW of R-p derived from 10 strains of the examined 30 nt strains were also 66 megadaltons and the 4 examined plasmids belonged also to IncI.alpha. Of the examined 15 2b and 30 nt strains, S. typhimurium var. copenhagen were 12 and 9 strains, respectively. Plasmid characterization complemented by phage inhibition tests offers another method to trace plasmids epidemiologically.

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