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. 2025 Aug 20;13(8):1947.
doi: 10.3390/microorganisms13081947.

Macrolide-Resistant Bordetella pertussis in Hong Kong: Evidence for Post-COVID-19 Emergence of ptxP3-Lineage MT28 Clone from a Hospital-Based Surveillance Study

Tsz-Yung Hui  1   2 , Hayes Kam-Hei Luk  1 , Garnet Kwan-Yue Choi  2 , Sandy Ka-Yee Chau  3 , Lok-Man Tsang  4 , Cindy Wing-Sze Tse  4 , Ka-Kin Fung  5 , Jimmy Yiu-Wing Lam  5 , Ho-Leung Ng  6 , Tommy Hing-Cheung Tang  7   8 , Edmond Siu-Keung Ma  9 , Herman Tse  10 , Sally Cheuk-Ying Wong  1   2 , Vivien Wai-Man Chuang  8 , David Christopher Lung  1   2
Affiliations

Macrolide-Resistant Bordetella pertussis in Hong Kong: Evidence for Post-COVID-19 Emergence of ptxP3-Lineage MT28 Clone from a Hospital-Based Surveillance Study

Tsz-Yung Hui et al. Microorganisms. .

Abstract

A post-COVID surge of Bordetella pertussis was observed globally. China has reported a high level of macrolide-resistant Bordetella pertussis (MRBP) in recent years; however, the epidemiology of MRBP in Hong Kong remains unknown. We retrieved archived B. pertussis isolates from respiratory samples collected at five regional public hospitals in Hong Kong between 2015 and 2024 and tested their minimum inhibitory concentration (MIC) for macrolides and other non-macrolide antibiotics using the Etest method. All isolates were also subjected to whole genome sequencing for genotypic resistance, Multi-locus Antigen Sequence Typing (MLST) and Multi-locus Variable Number of Tandem Repeat Analysis (MLVA) typing. Twenty-nine isolates of B. pertussis were included in the study. All isolates demonstrating phenotypic macrolide resistance harbored the A2047G mutation while showing low MIC to trimethoprim-sulfamethoxazole, doxycycline, levofloxacin, piperacillin-tazobactam and meropenem. In 2023 and 2024, 100% were MRBP and all belonged to the MT28 clone with the ptxP3 antigenic type. The MRBP isolates in Hong Kong were phylogenetically related to those from mainland China during the same period. There was no obvious correlation between macrolide resistance and clinical presentation, laboratory findings, management and outcome. Phylogenetic analysis suggests that MRBP isolates in Hong Kong and mainland China are closely related.

Keywords: Bordetella pertussis; macrolide-resistant; pertussis; whooping cough.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Macrolide resistance of Bordetella pertussis in Hong Kong, 2015–2024. MSBP, macrolide-sensitive Bordetella pertussis; MRBP, macrolide-resistant Bordetella pertussis.
Figure 2
Figure 2
(a) Wholesale supply of antimicrobials in Hong Kong, 2015–2024, measured in daily defined dose per 1000 inhabitants; (b) Wholesale supply of antimicrobials in Hong Kong, 2015–2024, measured in percentage. Linear regression: p = 0.06.
Figure 3
Figure 3
Phylogenetic tree based on the complete genome of macrolide-resistant Bordetella pertussis isolates and other isolates of the same period. In red, isolates from study; in purple, isolates from mainland China; in blue, isolates from other countries; in green, reference strain. #, isolate; MRBP, macrolide-resistant Bordetella pertussis; ptxP1, pertussis toxin promoter 1; ptxP3, pertussis toxin promoter 3.
Figure 4
Figure 4
Phylogenetic tree based on the complete genome of macrolide-sensitive and macrolide-resistant Bordetella pertussis isolates and other isolates of the same period. In red, MRBP from study; in black, MSBP from study; in purple, MRBP from mainland China; in blue, MRBP from other countries; in green, reference strain. #, isolate; MSBP, Macrolide-sensitive Bordetella pertussis; MRBP, macrolide-resistant Bordetella pertussis; ptxP1, pertussis toxin promoter 1; ptxP3, pertussis toxin promoter 3.
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