[The first identification of epidemic clone of enterotoxic Escherichia coli Oâ¶6 serogroup highly associated with azithromycin resistance in Shanghai].
Zhonghua Liu Xing Bing Xue Za Zhi
; 40(11): 1403-1408, 2019 Nov 10.
Article
em Zh
| MEDLINE
| ID: mdl-31838812
ABSTRACT
Objective:
To investigate the molecular characterization of adult diarrhea cases caused by enterotoxic Escherichia coli (ETEC) and explore the practical model of epidemiology for laboratory technique and data needs based on the surveillance network.Methods:
Epidemiological design and sampling targeted adult cases ETEC caused diarrhea in epidemic season. The enterotoxin type, serogroup, resistance, colonization factor and molecular type of ETEC were identified. Multiple dynamic phenotypic characteristics of ETEC were indicated by multidimensional and multivariable data.Results:
From 2016 to 2018, 84 eligible ETEC strains were detected. The dominant serums/toxins were Oâ¶6 (STh), Oâ¶25 (LT), Oâ¶159 (STh), Oâ¶153 (STh). Oâ¶6 (STh+CS21), which replaced Oâ¶25 and Oâ¶159 as the popular clones in 2018. Six cases of Oâ¶153 (STh+CFA/I+CS8+PT34) in outbreak in 2017 were imported ones. The resistance rates of ETEC strains detected in adults to sulfasoxazole, naproxinic acid, ampicillin and azithromycin were more than 30%, multidrug resistance (MDR) reached 58.3%. Serum/toxin types suggested that attenuated strains were more likely to become MDR. Molecular typing confirmed that the genetic similarity of the dominant clone of Oâ¶6 serogroup (PT20-24) was higher than Oâ¶25 and Oâ¶159. There was a high correlation between the minimal inhibitory concentration (MIC) of azithromycin and the resistant gene mphA (87.5%, 28/32). Oâ¶6 (STh+CS21+mphA) resistant clone was first detected in 2016.Conclusion:
A new epidemic clone in adult ETEC diarrhea cases in Shanghai was Oâ¶6 (STh+CS21+mphA). For the first time the association between azithromycin resistance gene mphA and a serum group of ETEC was observed. Multidimensional and multivariate analysis techniques based on epidemiology can help reveal the potential transmission pattern of ETEC for the accurate surveillance and early warning of outbreaks.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Azitromicina
/
Diarreia
/
Enterotoxinas
/
Infecções por Escherichia coli
/
Escherichia coli Enterotoxigênica
/
Antibacterianos
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Adult
/
Humans
País/Região como assunto:
Asia
Idioma:
Zh
Revista:
Zhonghua Liu Xing Bing Xue Za Zhi
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
China