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Clinical characteristics, molecular epidemiology and antimicrobial susceptibility of pertussis among children in southern China

  • Jiao-Sheng Zhang
  • Hong-Mei Wang
  • Kai-Hu Yao
  • Ying Liu
  • Yan-Ling Lei
  • Ji-Kui Deng
  • Yong-Hong YangEmail author
Original Article

Abstract

Background

Increasing numbers of pertussis cases have been reported in recent years. The reported cases from Shenzhen Children’s Hospital were close to one tenth of all cases in China. The epidemiology of antigenic genotype and antibiotic resistance of circulating strains in children have been unknown in Shenzhen, southern China. The aim of this study was to describe the clinical features and explore the genotypes and antimicrobial susceptibility of circulating Bordetella pertussis among children in Shenzhen.

Methods

Data of hospitalized children with pertussis in Shenzhen Children’s Hospital from August 2015 to April 2017 were collected. The genetic variability of isolates was investigated and Etest was performed for phenotypic susceptibility to erythromycin, azithromycin, clarithromycin, clindamycin, and trimethoprim/sulfamethoxazole.

Results

469 children with pertussis confirmed by real-time quantitative polymerase chain reaction were hospitalized and strains were isolated from 105 patients. White blood cell count ≥ 20 × 109/L and lymphocyte proportion ≥ 60% were observed in 39.29% of infants younger than 3 months. The two predominant profiles of virulence-associated allelic genes were ptxA1/ptxC1/ptxP1/prn1 (48.6%) and ptxA1/ptxC2/ptxP3/prn2 (44.8%). Among the isolates, 48.6% (51/105) were found resistant to macrolides.

Conclusions

These findings indicate that leukocytosis is not a sensitive indicator of pertussis. Isolates with the gene profile ptxP3/prn2 were highly circulating in Shenzhen and less resistant to macrolides, different from patterns observed in other parts of China.

Keywords

Antimicrobial susceptibility Bordetella pertussis Children Genotype Virulence 

Notes

Acknowledgements

The authors would like to sincerely thank all the members in Laboratory of Microbiology and Immunology, Beijing Children's Hospital Affiliated to Capital Medical University who participated in this study and the linguistic assistance.

Author contributions

YHY, JKD, and KHY were responsible for the study concept and design, and revised the manuscript. JSZ were responsible for the study concept and design, and contributed to the data analysis and writing of the manuscript. HMW, YL and YLL carried out the experimental work. All authors reviewed and agreed the final manuscript.

Funding

This research was funded by Sanming Project of Medicine in Shenzhen (SZSM201512030). The funding organization had no involvement in study design, collection of data, the writing of draft, and the decision to submit the article for publication.

Compliance with ethical standards

Ethical approval

This study was approved by the ethics committee of Shenzhen Children’s Hospital. The protocol of this study was in accordance with the principles of the Declaration of Helsinki.

Conflict of interest

All authors declare no competing interests.

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Copyright information

© Children's Hospital, Zhejiang University School of Medicine 2019

Authors and Affiliations

  • Jiao-Sheng Zhang
    • 1
    • 2
  • Hong-Mei Wang
    • 2
  • Kai-Hu Yao
    • 1
  • Ying Liu
    • 1
  • Yan-Ling Lei
    • 2
  • Ji-Kui Deng
    • 2
  • Yong-Hong Yang
    • 1
    • 2
    Email author
  1. 1.Laboratory of Microbiology and ImmunologyBeijing Children’s Hospital Affiliated to Capital Medical UniversityBeijingChina
  2. 2.Department of Infectious DiseasesShenzhen Children’s HospitalShenzhenChina

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