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Microbiological treatment failure associated with macrolide-resistant Bordetella pertussis
David Prabhakar1, Winkie Fong2,3, Eby M Sim2,3
1Microbiology and Infectious Diseases, Children's Hospital at Westmead, Sydney, New South Wales, Australia.
Background:
Despite successful vaccination programs, many countries are experiencing a marked rise in pertussis cases since 2024, compounded by the emergence of macrolide-resistant Bordetella pertussis (MRBP). Here, we report the clinical, laboratory, and genomic features of MRBP isolated from a child with severe pertussis.
Case Summary:
An 11-week-old term infant with pertussis who required intensive care unit support remained B. pertussis culture-positive despite azithromycin therapy. Pre- and post-treatment isolates demonstrated phenotypic drug resistance and carried known 23S rRNA macrolide-resistance conferring mutations.
Conclusion:
The international spread of macrolide-resistant B. pertussis warrants the introduction of susceptibility testing for this pathogen.
Insights
Macrolide-resistant *Bordetella pertussis* (MRBP) is increasing globally. This study details a severe pertussis case in an infant resistant to azithromycin, highlighting the need for susceptibility testing.
Area of Science:
- Microbiology
- Infectious Diseases
- Genomics
Background:
- Pertussis (whooping cough) cases are rising globally, even with vaccination.
- The emergence of macrolide-resistant *Bordetella pertussis* (MRBP) complicates treatment.
- This study focuses on a severe pertussis case involving MRBP.
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