7% Oxacillin (1 μg) 107 0 0% Cefoxitin (30 μg) 107 0 0% Erythromycin (15 μg) 99 8 7.5% Clindamycin (2 μg) 103 4 3.7% Tetracycline (30 μg) 107 0 0% Ciprofloxacin (5 μg) 101 6 5.6% Chloramphenicol (30 μg) 107 0 0% Fusidic Acid (10 μg)
104 3 2.8% Gentamicin (10 μg) 107 0 0% Mupirocin (5 μg and 200 μg) 107 0 0% S= Susceptible; R= Resistant. Molecular typing has been useful in understanding Autophagy inhibitor mouse the epidemiology of S. aureus from animal and human hosts [18]. S. aureus is highly clonal in nature and though some are exclusively adapted to specific hosts [19], others are able to colonize multiple hosts [20–22]. Of the 107 S. aureus isolates, 70 (representing OICR-9429 isolates obtained from faecal samples in the various sites) were randomly selected and further characterized. All the isolates were PVL-negative and 65 (92.9%) were grouped with coagulase (coa) type VI, but 5 (7.1%) were non-typeable. The accessory Temsirolimus gene regulator (agr) typing classified 69 of the 70 isolates into the following: type I (12; 17.1%), type II (3; 4.3%), type III (1; 1.4%) and type IV (53; 75.7%). Based
on their genotypic characteristics, ten representative isolates were selected for MLST and nine new sequence types: ST1725, ST1726, ST1727, ST2463-ST2467 and ST2470 were identified, and the sequences for the housekeeping genes have been deposited in the MLST database (http://www.mlst.net), while one representative isolate (Q22) was assigned with ST15. Overall, the 70 isolates were assigned into five main genotypes A to E (Table 2). Table 2 Genotypes identified in 70 S. aureus isolates from
faecal samples of E. helvum in Nigeria hsp60allelic type coa agr Representative isolate ID Allele No of isolates (%) arcC, aroE, glpf, gmk, pta, tpi, yqiL MLST (ST) A0 VI IV F10 1-13-84-1-12-5-11 (ST1725) 14 (20) A1 VI IV 02 (2.9) B0 VI IV AC19 1-13-84-1-184-5-11 (ST1726) 21 (30) B1 VI IV 01 (1.4) B2 VI NT R5 193-245-227-136-185-5-11 (ST1727) 01 (1.4) C0 VI IV AC10 211-303-303-142-195-211-274 Cytidine deaminase (ST2463) 15 (21.4) C1 NT I F9 270-305-248-188-266-202-186 (ST2464) 01 (1.4) C2 NT II P1 211-305-248-188-195-202-275 (ST2465) 01 (1.4) C3 NT II Q15 270-307-304-143-195-202-276 (ST2466) 01 (1.4) C4 NT III R3 271-356-248-189-267-202-186 (ST2467) 01 (1.4) D0 VI I 09 (12.9) D1 VI I F16 272-357-306-190-268-270-277 (ST2470) 01 (1.4) D2 VI I 01 (1.4) E0 NT II Q22 13-13-1-1-12-11-13 (ST15) 01 (1.4) TOTAL 70 (100) NT: Non-typeable. coa: coagulase gene. agr: accessory gene regulator. All the isolates were PVL negative. As shown in Figure 2, there was a clear phylogenetic out-group among the S. aureus taxon consisting of isolates in the hsp60-allele types C and D, which suggests that these genotypes diverged long before clones belonging to the major S. aureus clades exhibited the current size of genetic divergence.