Article
Effect of vaccination on Bordetella pertussis strains, China.
Emerging infectious diseases - 1 Nov 2010
Zhang Liu, Xu Yinghua, Zhao Jianhong, Kallonen Teemu, Cui Shenghui, Xu Yunqiang, Hou Qiming, Li Fengxiang, Wang Junzhi, He Qiushui, Zhang Shumin
Abstract excerpt
Whole-cell pertussis vaccine was introduced in China in the early 1960s. We used standard typing methods to compare 96 Bordetella pertussis isolates collected before and after introduction of vaccination, during 1953-2005. The following vaccine-type alleles of the pertussis toxin (ptx) gene were characteristic for all prevaccination strains: ptxA2, ptxA3, and ptxA4. The shift to ptxA1 occurred since 1963. All...
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