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Abstract

Pertussis remains a public health concern in South Africa, with an increase in reported cases and outbreaks in recent years. Whole genome sequencing was performed on 32 isolates sourced from three different surveillance programmes in South Africa between 2015 and 2019. Genome sequences were characterized using multilocus sequence typing, vaccine antigen genes (, , , and ) and overall genome structure. All isolates were sequence type 2 and harboured the pertussis toxin promoter allele . The dominant genotype was 3122 (31/32, 96.9 %), with no pertactin-deficient or other mutations in vaccine antigen genes identified. Amongst 21 isolates yielding closed genome assemblies, eight distinct genome structures were detected, with 61.9 % (13/21) of the isolates exhibiting three predominant structures. Increases in case numbers are probably not due to evolutionary changes in the genome but possibly due to other factors such as the cyclical nature of disease, waning immunity due to the use of acellular vaccines and/or population immunity gaps.

Funding
This study was supported by the:
  • National Institutes of Health (Award D43TW011255)
    • Principle Award Recipient: Annevon Gottberg
  • Sanofi Pasteur (Award PER00059)
    • Principle Award Recipient: FahimaMoosa
  • Centers for Disease Control and Prevention (Award 5U51IP000155)
    • Principle Award Recipient: CherylCohen
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2023-12-20
2024-05-20
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