Application evaluation of modified TT enrichment broth in separation of intestinal pathogenic Salmonella and Shigella bacteria / 国际检验医学杂志

ABSTRACT

Objective To analyze the effect evaluation of modified TT enrichment broth in the separation of intestinal pathogenic Salmonella and Shigella bacteria .Methods The routine inoculation of Macconkey agar and SS agar were adopted ,meanwhile two different methods for adding the modified TT enrichment broth(sodium thiosulfate and calcium carbonate) were used to screen Sal‐monella and Shigella bacteria .Serum coagulation was performed by referring to the bacterial isolation situation over the years .The SPSS 18 .0 software was adopted to process the data .Then the difference in the separation rate of Salmonella and Shigella bacteria between the two different stool culture methods was compared .Results Totally 790 stool culture samples during 2013-2015 were included into the statistical analysis ,30 cases of Salmonella bacteria were isolated by adopting the routine method ,the positive rate was 3 .80% ;5 cases were Shigella bacteria ,the positive rate was 0 .63% ;but 77 cases of Salmonella bacteria were isolated by adop‐ting the modified TT enrichment broth method ,the positive rate was 9 .75% ,7 cases were Shigella bacteria ,the positive rate was 0 .89% ;the detection rate of Salmonella bacteria by adopting the modified TT enrichment broth method was 2 .57 times of the con‐ventional culture method ,which of Shigella bacteria was 1 .41 times ,showing that the difference of Salmonella and Shigella bacteria isolation between the two different methods had statistical significance(P<0 .05) .Conclusion The modified TT enrichment broth can significantly improve the positive isolation rate of Salmonella and Shigella stool culture ,which provides larger help for clinical doctor′s correct diagnosis and treatment of patients .