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BMC Infectious Diseases
Published in: BMC Infectious Diseases 1/2015

Open Access 01-12-2015 | Research article

Serotype distribution and antibiotic resistance of Streptococcus pneumoniae isolates collected at a Chinese hospital from 2011 to 2013

Authors: Songyin Huang, Xiaoqiang Liu, Weisi Lao, Suhua Zeng, Huiqi Liang, Rihui Zhong, Xinlu Dai, Xiquan Wu, Hongyu Li, Yandan Yao

Published in: BMC Infectious Diseases | Issue 1/2015

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Abstract

Background

Streptococcus pneumoniae infections are a major cause of global morbidity and mortality, and the emergence of antibiotic-resistant Streptococcus pneumoniae strains has been increasingly reported. This study provides up-to-date information on bacterial serotype distribution and drug resistance from S. pneumoniae clinical isolates that could guide prevention and treatment strategies for pneumococcal disease in China.

Methods

A total of 94 S. pneumoniae isolates were collected from outpatients and inpatients at one Chinese hospital from 2011–2013. Drug susceptibility and resistance was determined by minimum inhibitory concentrations (MICs). Capsular serotypes were identified by the quellung reaction test and multiplex polymerase chain reaction.

Results

Fifteen serotypes were identified among the 94 S. pneumoniae clinical isolates that were collected. Prevalent serotypes were 19F (42.6 %), 19A (8.5 %), 3 (8.5 %), and 6B (7.4 %). Potential immunization coverage rates for the 7-, 10- and 13-valent pneumococcal polysaccharide conjugate vaccines were 59.6, 62.6, and 79.6 %, respectively. Resistance rates to tetracycline, erythromycin, and trimethoprim/sulfamethoxazole were 91.2, 80.2 and 63.8 %, respectively. Resistance rates to penicillin, amoxicillin, ceftriaxone, and cefotaxime were 47.3, 34.1, 19.8, and 18.7 %, respectively. In almost all cases, antimicrobial resistance of the S. pneumoniae isolates in patients five years or younger was higher than isolates collected from patients aged 51 years or older.

Conclusion

Prevalent serotypes among the 94 S. pneumoniae clinical isolates were 19F, 19A, 3, and 6B. The 13-valent pneumococcal polysaccharide conjugate vaccine covered the majority of the serotypes identified in this sample. Drug resistance varied among different serotypes and age groups. Clinical precautions should be taken to avoid the development of multidrug resistance in this potential human pathogen.
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Metadata
Title
Serotype distribution and antibiotic resistance of Streptococcus pneumoniae isolates collected at a Chinese hospital from 2011 to 2013
Authors
Songyin Huang
Xiaoqiang Liu
Weisi Lao
Suhua Zeng
Huiqi Liang
Rihui Zhong
Xinlu Dai
Xiquan Wu
Hongyu Li
Yandan Yao
Publication date
01-12-2015
Publisher
BioMed Central
Published in
BMC Infectious Diseases / Issue 1/2015
Electronic ISSN: 1471-2334
DOI
https://doi.org/10.1186/s12879-015-1042-5

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