目的分析1例2岁幼儿B群流脑病例的流行病学特征及其与周围健康人群带菌情况的关系。方法开展对病例、密切接触者及其周围健康人群流行病学调查,收集密切接触者及其周围健康人群的咽拭子标本进行菌株的分离培养和分型。结果病例临床症状、流行病学及实验室检测支持为B群流脑。其父母均为B群流脑带菌,周围健康人群带菌调查结果显示B群带菌率高达8.97%,占所有带菌人群的76.92%。结论密切接触者及病例周围健康人群B群带菌率高,高度怀疑本例病例是与周围人群密切接触后发病。 Objective To analyze the epidemiological characteristics of B group meningitis in a 2-year-old infants and its relationship with the carriage of healthy people around the area. Methods To carry out epidemiological investigation on cases, close contacts and surrounding healthy people, and to collect the throat swab specimens from close contacts and the surrounding healthy people to isolate and culture the strains. Results The clinical symptoms, epidemiology and laboratory tests supported group B meningitis. Their parents were all B-group meningitis carriers. The results of the survey on healthy carriers in surrounding areas showed that the carrier rate of B group was as high as 8.97%, accounting for 76.92% of all carriers. Conclusion In close contacts and in healthy people around the case group B with high bacterial population, a high degree of suspicion in this case is close contact with the crowd after the onset.