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在长葛县，人口４１３３和２８５４人的两农村分别进行了三和四年的菌痢病后免疫持续期观察。每年７－９月的所有腹泻病人均进行细菌学检查。观察期内共发现细菌学确诊菌痢病人７７６例（福氏菌莉５７６例），其中９４例在此期内再患菌痢。病后１－３月内．虽未见福氏和志贺氏２型同血清型，及宋氏、鲍氏同群再感染，以及病例很少的鲍氏菌痢（１７例）观察期内未见同群再感染，但病后９－１５，２１－２７，３３－３９个月，优势流行菌，即福氏菌的同血清型再感染均有发生，病例罗少的志贺氏２型（９７例）和宋氏（８６例）的同型再感染也在病后２１－２７和３３－３９个月分别出现。各群、型菌痢病后１－３个月内，异群、型再感染均有发生，且９－１５个月前患和未患福氏２ａ或１ｂ菌痢者再患同型菌痢的机率并无显著差别。看来菌痢病后产生的同型、群免疫持续期仅１年左右。
In Changge County, population of 4133 and 2854 people in two rural areas were carried out after three and four years of dysentery after the immune duration of observation. All diarrhea patients undergo a bacteriological examination from July to September each year. During the observation period, a total of 776 bacterial bacteriologically confirmed bacillary dysentery cases were found (576 cases of Forsytheomycete and Lactarius), of which 94 cases developed bacillary dysentery during this period. Within 1 to 3 months after illness. Although the same type of serotypes of Schistosoma mansoni and Shigella type 2, and the re-infection of the same group of Borrelia and Bordetella were not found, as well as the caseinosis of diarrhea (17 cases), there was no re-infection of the same group in the observation period After 9-15,21-27,33-39 months, the dominant epidemic bacteria, ie, the same serotype of Fungi re-infection have occurred in patients with less cases of Shiga type 2 (97 cases) and Song ( 86 cases) of the same type of re-infection also in the disease after 21-27 and 33-39 months, respectively. Each group, type bacillary dysentery within 1-3 months, heterosexual and re-infection have occurred, and 9-15 months ago and did not suffer from 2a or 1b bacillary dysentery patients suffering from the same type of dysentery There is no significant difference in probability. It appears that the bacillary dysentery caused by the same type, group duration of immunity is only about 1 year.