Key;
Laboratory;
o(Major;
Diseases;
in;
Children;
and;
National;
KeyDiscipline;
of;
Pediatrics,;
Ministry;
of;
Education,;
Beijing;
PediatricResearch;
Institute,;
Beijing;
Children's;
Hospital;
Affiliated;
to;
CapitalMedical;
University,;
Beijing;
100045,;
China;
肺炎链球菌; 血清型; 分子流行病学; 北京; 脉冲场凝胶电泳; 儿童; PFGE; 耐药性监测;