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体内带有病原菌，但无临床症状的人。带菌者能不断排出病原菌传染周围的人群。因其不出现临床症状，不易被察觉而加以隔离，其危害性常甚于病人，被视为最危险的传染源。健康人（包括隐性感染者）体内带有病原菌的，称为健康带菌者。如在流行性脑膜炎或白喉流行期间，不少健康人的鼻咽腔内可带有脑膜炎球菌或白喉杆菌。医生、护士常与病人接触，很易成为带菌者，在病人中传播，引起病人的交叉感染。有些传染病患者病愈后，体内仍有病原菌不断排出，该类人群称为恢复期带菌者。伤寒、痢疾病人恢复期带菌者比较多见。
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