β-Lactamase production and antibiotic susceptibility pattern of Moraxella catarrhalis isolates collected from two county hospitals in China

BMC Microbiology
W ShiKai-Hu Yao

Abstract

Moraxella catarrhalis (M. catarrhalis) is an important bacterial pathogen. However, its antibiotic susceptibility patterns in different areas are difficult to compare because of the use of different methods and judgement criteria. This study aimed to determine antimicrobial susceptibility and β-lactamase activity characteristics of M. catarrhalis isolates collected from two county hospitals in China, and to express the results with reference to three commonly used judgement criteria. Nasopharyngeal swabs were obtained from child inpatients with respiratory tract infections at the People's Hospital of Zhongjiang County and Youyang County from January to December 2015. M. catarrhalis strains were isolated and identified from the swabs, and susceptibility against 11 antimicrobials was determined using the E-test method or disc diffusion. Test results were interpreted with reference to the standards of the European Committee on Antimicrobial Susceptibility Testing (EUCAST), the Clinical and Laboratory Standards Institute (CLSI), and the British Society for Antimicrobial Chemotherapy (BSAC). Detection of β-lactamase activity was determined by the chromogenic cephalosporin nitrocefin. M. catarrhalis yield rates were 7.12 and 9.58% (Z...Continue Reading

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