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百日咳在瑞典消失了十多年之后,七十年代又重新出现,而且在各年龄组里都有发现,许多成年人也被传染了。哥德堡(Gothenburg )临床细菌研究室1976年至1978年从3,488个病人中分离到百日咳杆菌,其中有174个为成年人(男51人,女123人)年龄20—81岁,平均35岁,60岁以上的老年患者有6人。23个患者小时候在五十年代接种过百日咳疫苗。41个30岁以下患者自称儿童时期患过“百日咳”。
Pertussis disappeared in Sweden more than a decade later, the seventies re-emerged, and found in all age groups, many adults have also been infected. From 1996 to 1978, the clinical bacteriological laboratory in Gothenburg isolated from 3,488 patients with Bordetella pertussis, of which 174 were adults (51 males and 123 females) aged 20-81 years, mean 35 years, 60 Six elderly patients over the age of six. Twenty-three patients had their pertussis vaccine vaccinated in the 1950s. 41 patients under the age of 30 claimed to have had “whooping cough” during their childhood.