Volume 14, Number 5—May 2008
Dispatch
Spread of Streptococcus suis Sequence Type 7, China
Changyun Ye*†1, Xuemei Bai†1, Ji Zhang†1, Huaiqi Jing†1, Han Zheng*1, Huamao Du†, Zhigang Cui†, Shouying Zhang†, Dong Jin*, Jianguo Xu*†
, Yanwen Xiong*, Ailan Zhao*, Xia Luo*, Qiangzheng Sun*, Marcelo Gottschalk‡, and Yanmei Xu*
, Yanwen Xiong*, Ailan Zhao*, Xia Luo*, Qiangzheng Sun*, Marcelo Gottschalk‡, and Yanmei Xu*
Table 1
Source, serotype, sequence type, and tetracycline-resistant genes in Streptococcus suis strains*
| No. strains |
Source (no.) |
Place of
isolation |
Year of
isolation (no.) |
Serotype (no.) |
ST (no.) |
tet gene (no. positive) |
Tn916 (no.) |
Virulence genes (no.) | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| cps2j |
mrp |
sly |
ef |
||||||||
| 98 outbreak-associated ST7 strains in China | |||||||||||
| 84 | Human patients | Sichuan, China | 2005 | 2 | ST7 | tetM (84) | Intact (84) | + (84) | + (84) | + (84) | + (84) |
| 8 | Diseased pigs | Sichuan, China | 2005 | 2 | ST7 | tetM (8) | Intact (8) | + (8) | + (8) | + (8) | + (8) |
| 4 | Human patients | Jiangsu, China | 1998 | 4 | ST7 | tetM (4) | Intact (4) | + (4) | + (4) | + (4) | + (4) |
| 2 |
Diseased pigs |
Jiangsu, China |
1998 |
2 |
ST7 |
tetM (2) |
Intact (2) |
+ (2) |
+ (2) |
+ (2) |
+ (2) |
| 8 ST7 strains isolated from sporadic cases in China | |||||||||||
| 5 | Human patients | 6 provinces, China | 2005 (2) 2006 (3) | 2 | ST7 | tetM (5) | Intact (5) | + (5) | + (5) | + (5) | + (5) |
| 3 |
Diseased pigs |
Jiangxi, China |
2005 |
2 |
ST7 |
tetM (3) |
Intact (3) |
+ 3) |
+ (3) |
+ (3) |
+ (3) |
| 7 ST1 and 1 untypeable strain isolated from sporadic cases in China | |||||||||||
| 5 | Human patients | Guizhou, Guangxi (4) | 2005 | 2 (4) 14 | ST1 | tetM (4) | Intact (4) | + (4) | + (5) | + (5) | + (5) |
| 3 |
Human patients |
3 provinces |
2006 |
2 |
ST1 (2)
UT |
tetO (2)
tetM |
Intact (1) |
+ (3) |
+ (3) |
+ (3) |
+ (3) |
| 12 serotype 2 strains from other countries | |||||||||||
| 5 | Human patients | Netherlands (2), France (3) | NA | 2 | ST1 | tetO (3) | + (5) | + (5) | + (5) | + (4) | |
| 3 | Diseased pigs | Netherlands, France, England | NA | 2 | ST1 | + (3) | + (3) | + (3) | + (2) | ||
| 4 |
Human patients (2), healthy pigs, diseased pigs |
Canada (3), England |
NA |
2 |
ST25 |
tetO (4) |
+ (4) |
– |
– |
– |
|
| 34 serotype reference strains | |||||||||||
| 1 | Human patients | Netherlands | NA | 14 | ST6 | – | – | + | – | ||
| 1 | Diseased pig | Denmark | NA | 13 | ST71 | tetM | Intact | – | – | + | – |
| 25 | Diseased pigs | Canada (11), Denmark (5), Netherlands (9) | NA | 1/2, 2–12, 15–16, 22–30, 32, 34 | ST1, ST35, ST53–55, ST68, ST69, ST72–73, ST75, ST77–78, ST80–82, ST87, ST91–92, UT (7) | tetO (11) | + (2) | + (2) | + (7) | + (1) | |
| 2 | Diseased calves | Canada, United States | NA | 20, 31 | ST70 (1), UT (1) | tetO (1) | – | – | – | – | |
| 1 | Diseased lamb | Canada | NA | 33 | UT | – | – | – | – | ||
| 4 | Healthy pigs | Canada | NA | 17–19, 21 | ST76 (2), ST79, UT | tetO (4) | – | – | + (2) | – | |
*ST, sequence type; tet, tetracycline; UT, untypeable by multilocus sequence typing; NA, not available.
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