Distribution of agr groups (alleles) and presence of virulence genes among SAB isolates from four different time periods.

1Incident rate ratio estimated with Poisson regression analysis.2Poisson regression analysis.3CC6, CC7, CC8, CC20, CC22, CC25, CC45, CC59, CC97, CC101, CC182, CC188, CC395, CC398, ST2319.4CC5, CC9, CC12, CC15, CC49.5CC1, CC30, including CC30 (ST34/42).6CC50, CC121.7Three isolates in CC20 and 6 isolates in CC395 were negative for lukD, but positive for lukE; results were counted for lukE.8The haemolysin gene hlb was excluded from the analysis on the grounds of poor probe performance, which yielded several ambiguous results.9Also known as enterotoxin sep.10Seven isolates in CC50 showed a partial deletion of the egc cluster missing seg.11Locus tag SACOL1057, GenBank CP000046.1: Position 1063016–1064026.12Locus tag SACOL1056, GenBank CP000046.1: Position 1061753–1062934.13Locus tag SACOL1970, GenBank CP000046.1: Position 2034319–2035485.14Numbers in brackets show the number of ambiguous results, which were not includedBold values are statistically significant.Distribution of agr groups (alleles) and presence of virulence genes among SAB isolates from four different time periods.