Table 2. Serotype distribution across Streptococcus suis strains isolated from pig tonsils.
Serotype distribution (Nā=ā317) | ||
Serotype | No. of strains | % |
2 | 45 | 14.2 |
9,31,32@ | 38 | 12 |
3 | 27 | 8.5 |
21 | 20 | 6.3 |
7 | 17 | 5.4 |
16 | 12 | 3.8 |
4 | 10 | 3.2 |
Other* | 65 | 20.5 |
Other, double serotypes** | 29 | 9.2 |
Other, triple serotypes** | 9 | 2.8 |
Untypeable# | 45 | 14.2 |
@ Serotyping was repeated three times; additional analysis of 7 representative strains by MLST and 16S rDNA sequencing confirmed that these strains are S. suis.
*Includes serotype 5, 8, 9,10, 11, 12, 13, 15, 19, 20, 22, 23, 25, 26, 27, 28, 29, 30, 31, 33.
**Strains reacting with antisera against two or three different serotypes.
#23 strains were auto-agglutinating, 16 strains could not be assigned to any serotype after agglutination with polyvalent antisera, and 6 strains reacted negatively with all poly-valent antisera.