Aim: To analyse the characteristics of Streptococcus pyogenes isolates from Chinese children with scarlet fever. Methods: Minimal inhibitory concentration with nine antibiotics was performed on 145 Streptococcus pyogenes isolates acquired from Beijing and Shanghai in 2007. Their macrolide-resistant genes (mefA, ermB and ermA - a subclass of ermTR), superantigens (speA and speC), and en-coding mature M protein gene (emm gene) were amplified by PCR. Results: A total of 97.9% of the isolates exhibited resistance to the macrolides, while 96.6% manifested resistance to tetracycline. All isolates were sensitive to chloramphenicol, penicillin, cefradine, and ofloxacin. Moreover, 94.5% exhibited a cMLSB phenotype, while 90.3% had the ermB gene. Five emm types (emm1.0, emm4.0, emm12.0, emm22.0 and st5240) were discovered, of which 9.7% carried the superantigen speA, 35.9% carried the speC, 42.8% carried both speA and speC and 11.7% carried neither speA nor speC. Finally, 85.5% of emm1.0 and 15.5% of emm12.0 isolates carried speA, while 79.0% of emm1.0 and 75.9% of emm12.0 isolates carried speC. Conclusion: The Streptococcus pyogenes isolates had high resistance rates against macrolides and tetracycline. They mainly expressed the ermB gene type and cMLSB phenotype. Their common emm types are emm1.0 and emm12.0, which have different frequencies of speA and speC.
基金：
Hi-Tech Research and Development ProgramNational High Technology Research and Development Program of China; Ministry of Sciences and Technology, ChinaMinistry of Science and Technology, China [2006AA02z417]
第一作者机构：[1]Capital Med Univ, Beijing Childrens Hosp, Beijing 100045, Peoples R China;
通讯作者：
通讯机构：[1]Capital Med Univ, Beijing Childrens Hosp, Beijing 100045, Peoples R China;[2]Fudan Univ, Childrens Hosp, Shanghai 200433, Peoples R China;[3]Capital Med Univ, Beijing Childrens Hosp, 56 S Lishi Rd, Beijing 100045, Peoples R China
推荐引用方式(GB/T 7714)：
Liang Yunmei,Shen Xuzhuang,Huang Guoying,et al.Characteristics of Streptococcus pyogenes strains isolated from Chinese children with scarlet fever[J].ACTA PAEDIATRICA.2008,97(12):1681-1685.doi:10.1111/j.1651-2227.2008.00983.x.
APA：
Liang, Yunmei,Shen, Xuzhuang,Huang, Guoying,Wang, Chuanqing,Shen, Ying&Yang, Yonghong.(2008).Characteristics of Streptococcus pyogenes strains isolated from Chinese children with scarlet fever.ACTA PAEDIATRICA,97,(12)
MLA：
Liang, Yunmei,et al."Characteristics of Streptococcus pyogenes strains isolated from Chinese children with scarlet fever".ACTA PAEDIATRICA 97..12(2008):1681-1685
