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Prevalence, phenotype and genotype characteristics of antibiotic resistance in coastal beach practitioners of tropical China
Wenfang Long, Tianjiao Li, Guohui Yi, Feng Liang, Gaoyao Hu, Jizhen Wu, Hairong Huang, Mingxue Li
One Health Bull
2022, 2:2 (28 April 2022)
To investigate the genetic mechanism and prevalence of antibiotic resistance among the practitioners of two bathing beaches in tropical China.
Totally 259 strains were isolated from the rectal swabs of the practitioners and screened by MacConkey agar. A questionnaire survey was conducted. Kirby-Bauer test was used for phenotype, and double disc inhibition synergy test was used for extended-spectrum β -lactamase-producing
(ESBL-E), which was further confirmed by VITEKII instrument. The genotype was detected by polymerase chain reaction, and the similarities of ESBL-E were analyzed using pulsed-field gel electrophoresis.
The prevalence of ESBL-E was 13.1% (34/259), of which,
genes accounted for 44.1% (15/34), mainly
. Moreover, 19.1% (4/21) of the isolates were homologous. The resistance phenotypes of ESBL-E to chloramphenicol, ciprofloxacin, levofloxacin, ceftazidime, cefepime and gentamicin were different between two beaches(
<0.05). The prevalence of ESBL-E was caused by
genes at the island beach, while a high prevalence of ESBL-E was found at the city beach and clone transfer occurred.
ESBL-E-associated gentamicin antibiotic resistance risk may be greater for island beach practitioners. The city beach populations could face more potential risks owing to severe resistance and metastatic ability of ESBL-E. The environmental exposure mechanisms and transfer role of antibiotic resistance at public beaches with high density should be investigated.
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