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常识使不少人以为成年人不会患百日咳,这是因为在应用百日咳疫苗以前,所有的成人基本上在儿童期都患过百日咳,以后又不断地接触患百日咳的儿童,因此对此病的免疫力很强。而自从本世纪40年代应用百日咳疫苗后,因疫苗产生的免疫力比自然患病的免疫力减弱得快,一般只能保持12年,故不少成年人也会染上百日咳,全世界每年至少有6000万人患百日咳,其中至少有10%以上是成年人。成人患百日咳症状一般较轻而不典型,极少有儿童患者的咳后呕吐、鸡鸣样吼声等症状。这些不典型的成人患者更易在家庭内传播百日咳,
Common sense makes many people think adults will not have pertussis, because before applying pertussis vaccine, all adults basically have had pertussis in childhood, and then continue to reach children with pertussis, so the disease Strong immunity. Since the application of the pertussis vaccine in the 1940s, vaccines produce a weaker immune system than naturally-occurring immunity and generally last only for 12 years. Therefore, many adults also develop pertussis, and the world has at least 60 million people suffer from pertussis, at least 10% of whom are adults. Adults suffering from pertussis symptoms are generally mild and atypical, very few children with cough and vomiting, cock-like roar and other symptoms. These atypical adult patients are more likely to spread pertussis in their homes,