Macrolide Resistance in Bordetella pertussis: Current Situation and Future Challenges

Abstract

Pertussis is a highly contagious respiratory infection caused by <i>Bordetella pertussis</i> bacterium. The mainstay of treatment is macrolide antibiotics that reduce transmissibility, shorten the duration of symptoms and decrease mortality in infants. Recently, the macrolide resistance of <i>B. pertussis</i> has been reported globally but is especially widespread in mainland China. In this review, we aim to summarise the current understanding of the epidemiology, resistance mechanisms and clinical implications of <i>B. pertussis</i> macrolide resistance. Since the first appearance of macrolide-resistant <i>B. pertussis</i> in Arizona, USA, in 1994, only sporadic cases have been reported outside China. In certain parts of China, on the other hand, up to 70-100% of the recent clinical isolates have been found to be macrolide resistant. Reasons for macrolide resistance being centred upon China during the last decade can only be speculated on, but the dominant <i>B. pertussis</i> lineage is different between China and most of the high-income countries. It seems evident that efforts to increase awareness, guide molecular epidemiological surveillance and carry out systematic screening of <i>B. pertussis</i> positive samples for macrolide resistance should be implemented globally. In addition, practices to improve the clinical care of infants with pertussis caused by resistant strains should be studied vigorously.