RESUMO
Phage-typing determination of cell-surface hydrophobicity, motility, and serovar-specific virulence plasmid was performed in a collection of 154 clinical isolates of S. enterica serovar Typhimurium (SeT) isolated in Slovakia. All isolates were also examined in PCR for the presence of both stn (enterotoxin) and iroB (siderophore) genes. The DT104 was the definitive phage type most frequently identified (37.7 %), the second most frequently isolated phage type was DT41 (5.8 %); the occurrence of other phage types was not epidemiologically significant. On the basis of virulence-marker investigation, 46.1 % of isolates were hydrophobic in the assay of bacterial adherence to xylene, and 97.4 % were hydrophobic in salt-aggregation test. Motility of more than 50 mm was expressed by 20.8 % isolates. The serovar-specific 90-kb virulence plasmid was contained in 138 (89.6 %) of isolates. All SeT isolates were found (according to PCR) to carry the Salmonella-enterotoxin (stn) gene and the siderophore (iroB) gene. The increasing incidence of SeT DT104 human strains in Slovakia requires continuous attention; this can be markedly improved by surveillance efficiency and made possible by determining relationships between sporadic isolates.
Assuntos
Tipagem de Bacteriófagos , Salmonella typhimurium/classificação , Salmonella typhimurium/patogenicidade , Animais , Aderência Bacteriana , Enterotoxinas/genética , Humanos , Interações Hidrofóbicas e Hidrofílicas , Movimento , Plasmídeos/genética , Reação em Cadeia da Polimerase/métodos , Salmonella typhimurium/genética , Salmonella typhimurium/isolamento & purificação , Sideróforos/genética , Eslováquia , Virulência/genéticaRESUMO
A total 44 isolates of S. enterica serovar Enteritidis (S. Enteritidis) belonged to three different phage types (PTs) 9a, 13a, 25 were analyzed by the technique of pulsed-field gel electrophoresis (PFGE). Thirty and three strains were from two outbreaks (central and southern regions of the Slovak Republic PTs 13a, 25) and 11 isolates were sporadic isolates (PT9a). These isolates showed two different patterns in PFGE with XbaI digestion. Strains of PT13a generated PFP A and isolates of PT25 showed uniform PFP B. Nine sporadic isolates of PT9a belonged to PFP A and two isolates to PFP B. The PFPs A and B were differed by only two bands. The distribution of XbaI profiles did not corresponded with PTs. We conclude that the close genetic similarity observed between epidemiologically unrelated and outbreak-related isolates of S. Enteritidis suggest clonal relationship of these isolates.
