Table 2.
Distribution of individual virulence-associated factor (VAF) genes in 273 S. suis isolates in SC, NSC, NSP, and NSH groups.
| VAF/genes | Product | Number (%) of isolates | |||||||
|---|---|---|---|---|---|---|---|---|---|
|
Total (n = 273) |
SC (n = 47) |
NSC (n = 65) |
NSH (n = 90) |
NSP (n = 71) |
Ser 9 (n = 38) |
Ser 2 (n = 23) |
Unt (n = 53) |
||
| AgI/II | Antigen I/II | 70 (26) | 16 (34) | 23 (35) | 24 (27) | 7 (10) | 23 (61) | 0 (0) | 8 (15) |
| apuA | Amylopullulanase | 266 (97) | 46 (97) | 64 (98) | 87 (97) | 69 (97) | 38 (100) | 23 (100) | 48 (90) |
| dltA* | D-alanine–D-alanyl carrier protein ligase | 190 (70) | 42 (89) | 46 (71) | 53 (59) | 49 (69) | 21 (55) | 15 (65) | 25 (47) |
| epf | Extracellular protein factor | 27 (10) | 5 (11) | 4 (6) | 6 (7) | 12 (16) | 0 (0) | 0 (0) | 2 (4) |
| guaA | GMP synthase | 262 (96) | 44 (94) | 64 (98) | 85 (94) | 69 (97) | 38 (100) | 23 (100) | 46 (87) |
| luxS* | S-ribosylhomocysteine lyase | 243 (89) | 45 (96) | 59 (91) | 71 (79) | 68 (96) | 37 (97) | 23 (100) | 34 (64) |
| mrp | Muramidase-released protein | 65 (24) | 15 (32) | 19 (29) | 17 (19) | 14 (20) | 0 (0) | 15 (65) | 2 (4) |
| pgdA | Peptidoglycan N-deacetylase | 245 (90) | 44 (94) | 60 (92) | 74 (82) | 67 (94) | 37 (97) | 23 (100) | 34 (64) |
| sly | Suilysin | 77 (28) | 13 (28) | 20 (31) | 22 (24) | 22 (31) | 1 (2) | 0 (0) | 4 (8) |
| troA* | Metal binding lipoprotein TroA | 245 (90) | 45 (96) | 60 (92) | 73 (81) | 67 (94) | 37 (97) | 23 (100) | 34 (64) |
SC = isolates from systemic sites in pigs with confirmed infections; NSC = isolates from non-systemic sites in pigs with confirmed infections; NSP = isolates from non-systemic sites in symptomatic pigs, which had no S. suis recovered from their systemic sites; NSH = isolates from non-systemic sites in healthy pigs; Total = SC + NSC + NSH + NSP.
*
Higher frequency in SC compared with NSH (p < 0.05).