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Volume 19, Number 6—June 2013

Research

Characteristics of Group A Streptococcus Strains Circulating during Scarlet Fever Epidemic, Beijing, China, 2011

Peng Yang1, Xiaomin Peng1, Daitao Zhang, Shuangsheng Wu, Yimeng Liu, Shujuan Cui, Guilan Lu, Wei Duan, Weixian Shi, Shuang Liu, Jing Li, and Quanyi WangComments to Author 
Author affiliations: Beijing Center for Disease Prevention and Control, Beijing, China; and Capital Medical University School of Public Health, Beijing

Main Article

Table 1

SAgs and emm types of group A Streptococcus circulating during a scarlet fever epidemic, Beijing, China, 2011*

emm type or SAg No. (%) patients, by age
p value No. (%) patients, by sex
p value No. (%) patients, by clinical diagnosis
p value Total, n = 647
<5 y, n = 246 >5 y, n = 401 Male, n = 402 Female, n = 245 Scarlet fever, n = 430 Pharyngitis, n = 217
emm type
12 203 (82.5) 291 (72.6) 0.004 303 (75.4) 191 (78.0) 0.453 331 (77.0) 163 (75.1) 0.599 494 (76.4)
1 34 (13.8) 77 (19.2) 0.078 73 (18.2) 38 (15.5) 0.386 83 (19.3) 28 (12.9) 0.042 111 (17.1)
Other†
9 (3.7)
33 (8.2)
0.022
26 (6.5)
16 (6.5)
0.975
16 (3.7)
26 (12.0)
<0.001
42 (6.5)
SAg
SpeA 47 (19.1) 96 (23.9) 0.150 91 (22.6) 52 (21.2) 0.675 99 (23.0) 44 (20.3) 0.427 143 (22.1)
SpeB 246 (100.0) 401 (100.0) NA 402 (100.0) 245 (100.0) NA 430 (100.0) 217 (100.0) NA 647 (100.0)
SpeC 243 (98.8) 400 (99.8) 0.156 398 (99.0) 245 (100.0) 0.303 427 (99.3) 216 (99.5) 1.000 643 (99.4)
SpeF 245 (99.6) 400 (99.8) 1.000 401 (99.8) 244 (99.6) 1.000 429 (99.8) 216 (99.5) 1.000 645 (99.7)
SpeG 246 (100.0) 399 (99.5) 0.528 400 (99.5) 245 (100.0) 0.529 428 (99.5) 217 (100.0) 0.554 645 (99.7)
SpeH 192 (78.0) 301 (75.1) 0.387 299 (74.4) 194 (79.2) 0.164 326 (75.8) 167 (77.0) 0.747 493 (76.2)
SpeI 190 (77.2) 302 (75.3) 0.578 301 (74.9) 191 (78.0) 0.373 327 (76.0) 165 (76.0) 1.000 492 (76.0)
SpeJ 47 (19.1) 92 (22.9) 0.249 87 (21.6) 52 (21.2) 0.900 99 (23.0) 40 (18.4) 0.180 139 (21.5)
SpeK 1 (0.4) 3 (0.7) 1.000 1 (0.2) 3 (1.2) 0.155 0 4 (1.8) 0.012 4 (0.6)
SpeL 2 (0.8) 5 (1.2) 0.715 4 (1.0) 3 (1.2) 1.000 2 (0.5) 5 (2.3) 0.046 7 (1.1)
SpeM 5 (2.0) 9 (2.2) 0.857 8 (2.0) 6 (2.4) 0.697 9 (2.1) 5 (2.3) 0.862 14 (2.2)
SmeZ 245 (99.6) 400 (99.8) 1.000 401 (99.8) 244 (99.6) 1.000 428 (99.5) 217 (100.0) 0.554 645 (99.7)
Ssa 241 (98.0) 391 (97.5) 0.705 394 (98.0) 238 (97.1) 0.477 427 (99.3) 205 (94.5) <0.001 632 (97.7)

*Boldface indicates statistical significance. SAg, superantigen.
†Other emm types included types 4, 11, 22, 75, and 89.
‡Fisher exact test was used.

Main Article

1These authors contributed equally to this article.

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