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2014年6月13日,美国加利福尼亚州公共卫生部(California Department of Public Health,CDPH)接到该州百日咳发病率已超过基线水平5倍的报告,随即宣布该州出现百日咳疫情。美国的百日咳发病存在周期性,随着易感人群的增加,每3~5年出现一个发病高峰。加利福尼亚州最后一次百日咳疫情发生在2010年,报告约9000例,包括808例住院病人和10例婴儿死亡,全州百日咳发病率为24.6/
On June 13, 2014, the California Department of Public Health (CDPH) received a report that the incidence of whooping cough in the state has exceeded 5 times the baseline level and immediately announced the occurrence of pertussis in the state. The incidence of pertussis in the United States there is periodic, with the increase of susceptible population, every 3 to 5 years a peak incidence. The last outbreak of pertussis in California occurred in 2010, reporting about 9,000 cases, including 808 in-patient and 10 infant deaths, and a statewide incidence of pertussis pertussis of 24.6 /