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Strains that showed resistance for oxacillin and cefoxitin were tested for the mecA gene with primers and condition as described by Siripornmongcolchai et al. (18) to confirm the identity of MRSA strains. Statistical calculation Pearson's Chi square BMS754807 test was used for testing differences between isolates from infected and non-infected carriers. P-value below 0.05 was considered significant. Results S. aureus isolates and phenotypic characteristics The frequency of S. aureus isolates recovered from the four subject groups are shown in Table 1. Isolates from oral infections occurred as could be expected as heavy growth and were predominant in comparison with alpha-hemolytic streptococci. None of the students had more than 100 CFU of S. aureus per ml saliva. Thirty-five (77.8%) of the 45 HIV-infected Thai subjects showed S. aureus as moderate growth or more and it occurred as sparse in the other subjects. Twelve (48.0%) of the 25 S. aureus-positive non-HIV subjects yielded S. aureus as moderate and heavy growth (>1,000 CFU/ml saliva). PFKM All strains were coagulase and nitrate positive, 91.1�C100% were arginine positive, and 82.2�C96.0% were urease positive. Only three Swedish strains (4.8%) isolated from infections were hemolytic compared to nine (36.0%) from the healthy individuals. There were no difference in the phenotypic characteristics of the 10 S. aureus strains isolated from oral deep infections compared to those isolated from mucosal infections. Among the Thai isolates 74.3% were hemolytic, which was significantly (p rate of genes for adhesins and toxins were found in the Swedish strains from both infections and healthy controls as well as in strains from the Thai HIV-positive patients and non-HIV controls. The exception was etb, which was not detected in any isolate, and seb that was only sporadically found. A high rate of the PVL gene (73.3�C100%) among all four subject BLZ945 purchase groups was noted and the 100% rate among isolates from non-HIV controls was significantly (p
