从５４７ 例腹泻患儿中检出弗劳地枸橼酸盐杆菌６２ 株，阳性率为１１３３ ％ ；１８０ 例正常小儿检出７ 株，检出率为３８８ ％ 。两者比较有显著性差异（ Ｐ＜ ０ ．０５） 。其中１ 岁内腹泻患儿感染率最高（２８／６２） 。用 Ｂｒｅｎｎｅｒ 法对分离的弗劳地枸橼酸盐杆菌进行基因种鉴定，８０６４ ％ 菌株可被准确鉴别，基因种以弗劳地枸橼酸杆菌具首位，布拉基枸橼酸盐杆菌次之。弗劳地枸橼酸盐杆菌所致的腹泻应引起人们的重视。 Of 547 children with diarrhea, 62 were isolated from Freundlicum citri, the positive rate was 1133%. Seven out of 180 normal children were detected, the detection rate was 388%. There was a significant difference between the two (P <0 .05). One year old children with diarrhea infection rate was the highest (28/62). The Brenner method was used to identify the isolated Citrobacter freundii, and 8064% of the isolates were identified accurately. The genus Fritillaria citri was the first genus, Second. Frail Citrobacter diarrhea should cause people’s attention.