4Kathrin Muhlemann,Hans C.Matter,Martin G.Tauber and so on.Nationwide Surveillance of Nasopharyngeal Streptococcus pneumoniae Isolates from Children with Respiratory Infection,Switzerland,1998~1999[J].JID,2003,187(15):589~596.
5Louie M,Louie L,Papia G,et al.Molecular analysis of the genetic variation among penicillin-susceptible and penicillin-resistant streptococcus penumoniae sertypes in canada[J].Infect dis,1999,1(4):892~900.
6Jin Yang Back,Kwan Soo Ko,Won Sup Oh.Unique variations of pbp2b sequences of penicillin-Nonsusceptible Strptococcus pneumoniae Isolates from Korea[J].Journal of Clinical Microbiology,2004,42(4):1 746~1 750.