Background:This study aims to analyze the genotypes and antibiotic resistance characteristics of Clostridioides difficile(C.difficile)isolated from children under 5 years old with diarrhea in Yunnan Province.Methods:F...Background:This study aims to analyze the genotypes and antibiotic resistance characteristics of Clostridioides difficile(C.difficile)isolated from children under 5 years old with diarrhea in Yunnan Province.Methods:Fecal samples from children under 5 years of age with diarrhea in Kunming city from 2013-2019 were collected for anaerobic culture,isolation,and identification of C.difficile.The antibiotic susceptibility tests and molecular typing of isolated strains were also performed.Results:44 strains of C.difficile were isolated from 896 fecal samples.Of these,40 strains(90.9%)were positive for both tcdA and tcdB,while 4 strains(9.1%)were negative for both.All isolates were negative for cdtA and cdtB.The isolates were classified into 13 STs,the predominant types were ST3(13 strains,29.5%),ST35(8 strains,18.2%),and ST54(5 strains,11.4%).All the strains were susceptible to metronidazole,amoxicillin/clavulanic acid,vancomycin,and amoxicillin.The highest resistance rate was observed against gentamicin(86.36%),followed by polymyxin E(84.09%),quinupristin-dalfopristin(61.36%),and ceftazidime(36.36%).Some patients with diarrhea had C.difficile co-infections with other pathogens,including norovirus,adenovirus,rotavirus or Salmonella or Escherichia coli.Conclusion:C.difficile strains isolated from children under 5 years of age are mostly toxigenic,and the MLST results are highly diverse.Monitoring and prevention of C.difficile should be strengthened.展开更多
基金supported by Yunnan Provincial Key Research and Development Program(grant No.202503AP140034)Infectious Disease Spectrum and Epidemiology Project of YNCDC(grant No.YNAPM2025-003).
文摘Background:This study aims to analyze the genotypes and antibiotic resistance characteristics of Clostridioides difficile(C.difficile)isolated from children under 5 years old with diarrhea in Yunnan Province.Methods:Fecal samples from children under 5 years of age with diarrhea in Kunming city from 2013-2019 were collected for anaerobic culture,isolation,and identification of C.difficile.The antibiotic susceptibility tests and molecular typing of isolated strains were also performed.Results:44 strains of C.difficile were isolated from 896 fecal samples.Of these,40 strains(90.9%)were positive for both tcdA and tcdB,while 4 strains(9.1%)were negative for both.All isolates were negative for cdtA and cdtB.The isolates were classified into 13 STs,the predominant types were ST3(13 strains,29.5%),ST35(8 strains,18.2%),and ST54(5 strains,11.4%).All the strains were susceptible to metronidazole,amoxicillin/clavulanic acid,vancomycin,and amoxicillin.The highest resistance rate was observed against gentamicin(86.36%),followed by polymyxin E(84.09%),quinupristin-dalfopristin(61.36%),and ceftazidime(36.36%).Some patients with diarrhea had C.difficile co-infections with other pathogens,including norovirus,adenovirus,rotavirus or Salmonella or Escherichia coli.Conclusion:C.difficile strains isolated from children under 5 years of age are mostly toxigenic,and the MLST results are highly diverse.Monitoring and prevention of C.difficile should be strengthened.
