Distribution of Biocide Resistance Genes and Association with Clonal Complex Genotypes in Staphylococcus aureus Isolated from School-Age Children in Guangzhou

Chao Zhang; Bingshao Liang; Zhile Xiong; Zhuwei Liang; Hao Cai; Huamin Zhong; Yongqiang Xie; Yuanwei Xie; Xiaochun Liu; Shiying Xie; Fangjun Lan; Zhenwen Zhou

doi:10.2147/IDR.S387528

Distribution of Biocide Resistance Genes and Association with Clonal Complex Genotypes in Staphylococcus aureus Isolated from School-Age Children in Guangzhou

Infect Drug Resist. 2022 Dec 7:15:7165-7175. doi: 10.2147/IDR.S387528. eCollection 2022.

Authors

Chao Zhang^#^{1

2}, Bingshao Liang^#¹, Zhile Xiong^{1

2}, Zhuwei Liang^{1

2}, Hao Cai¹, Huamin Zhong¹, Yongqiang Xie¹, Yuanwei Xie², Xiaochun Liu², Shiying Xie², Fangjun Lan², Zhenwen Zhou²

Affiliations

¹ Clinical Laboratory, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, People's Republic of China.
² Clinical Laboratory, Longgang District Maternity and Child Healthcare Hospital, Shenzhen, Guangdong, People's Republic of China.

^# Contributed equally.

Abstract

Purpose: Chlorhexidine and mupirocin are often prescribed to children in affected communities to prevent colonization and transmission of Staphylococcus aureus, but this has led to an increasing rate of biocide resistance. In this study, we aimed to determine the distribution of biocide resistance genes among S. aureus isolates from school-age children in Guangzhou, investigate chlorhexidine gluconate and mupirocin susceptibility and clonal complex (CC) genotypes in strains carrying biocide-resistance genes, and further explore the role of biofilms in this resistance.

Patients and methods: Antibiotic resistance and multilocus sequence genotyping were performed on 722 S. aureus isolates from previous study. The distribution of nine biocide genes (qacA/B, mupA, mepA, sepA, norA, lmrS, smr, mupB, qacG) was determined by PCR. Isolates carrying qacA/B or mupA genes were further tested for susceptibility to chlorhexidine gluconate (CHG) and mupirocin and biofilm formation abilities.

Results: The most prevalent of the nine biocide resistance genes were mepA (95.57%), followed by norA (78.81%), lmrS (77.01%), and sepA (58.17%). The qacG gene was not detected. Distribution of sepA was significantly decreased in CC30 and CC45 genotypes, and presence of sepA was associated with resistance to antibiotics such as CLI, ERY, TCY, SXT, CIP, and LVX. In addition, 64 (94.1%, n=68) qacA/B+ isolates showed CHG resistance, 12 (100.0%, n=12) mupA+ isolates were mupirocin resistant, and 4 (80%, n=5) and 5 (100%, n=5) qacA/B+mupA+ isolates were CHG and mupirocin resistant, respectively. Of these 85 isolates, 98.8% (n=84) had different degrees of biofilm-forming abilities, which were positively associated with CHG and mupirocin resistance.

Conclusion: The distribution of biocide resistance genes was associated with special CCs. The qacA/B and mupA genes are highly associated with resistance to CHG and mupirocin, and biofilm formation was found to contribute to this biocide resistance.

Keywords: Staphylococcus aureus; biocide resistance genes; biofilm formation; children; chlorhexidine; mupirocin; qacA/B.

Grants and funding

This study was funded by the National Natural Science Foundation of China (No. 82002202), Guangzhou Science Technology and Innovation Commission (No. 201707010010), Basic Research Project of Shenzhen Municipality (Natural Science Foundation) (JCYJ20220530162415036) and Longgang Medical and Health Science and Technology Project (LGKCYLWS2022029).