Table 3.

Occurrence and frequency of potential virulence genes andmecA among prevalent and sporadic SALs as determined by PCR analysis

Group tested% Positive for gene (no. of positive isolates/no. of isolates tested)
mecAtstcnafnbAfnbBhlahlbclfA
SAL
 SAL 15.5 (2/37)95.4 (42/44)93.6 (44/47)85.7 (24/28)0 (0/36)100 (21/21)9.6 (3/31)100 (5/5)
 SAL 20 (0/21)0 (0/7)8.7 (2/23)90 (9/10)95.2 (20/21)100 (8/8)0 (0/18)100 (2/2)
 SAL 490.2 (37/41)7.7 (2/26)0 (0/47)96 (24/25)0 (0/39)100 (30/30)65.9 (31/47)100 (15/15)
 SAL 510.5 (2/19)4 (1/25)100 (27/27)85.7 (12/14)0 (0/23)100 (20/20)0 (0/20)100 (6/6)
 SAL 60 (0/9)0 (0/11)100 (17/17)100 (8/8)0 (0/16)100 (10/10)70.5 (12/17)100 (4/4)
Total prevalent lineages32.2 (41/127)39.8 (45/113)55.9 (90/161)91 (77/85)14.8 (20/135)100 (88/88)34.5 (46/133)100 (32/32)
Sporadic lineages22.2 (14/63)0 (0/38)25 (15/60)86.6 (39/45)22.7 (10/44)100 (31/31)38.1 (21/55)90.4 (19/21)
All isolates27.9 (55/197)28.6 (45/157)44.9 (107/237)89.7 (122/136)20.1 (38/189)100 (128/128)38.8 (77/200)96.2 (51/53)
 Frequency analysis result (Fisher's exact test; prevalent vs sporadic)0.175<0.0001<0.00010.5560.2470.0000.7380.152