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Volume 10, Issue 2

Pneumococcal population genomics changes during the early time period of conjugate vaccine uptake in southern India Open Access

Abstract

is a major cause of invasive disease of young children in low- and middle-income countries. In southern India, pneumococcal conjugate vaccines (PCVs) that can prevent invasive pneumococcal disease began to be used more frequently after 2015. To characterize pneumococcal evolution during the early time period of PCV uptake in southern India, genomes were sequenced and selected characteristics were determined for 402 invasive isolates collected from children <5 years of age during routine surveillance from 1991 to 2020. Overall, the prevalence and diversity of vaccine type (VT) and non-vaccine type (NVT) isolates did not significantly change post-uptake of PCV. Individually, serotype 1 and global pneumococcal sequence cluster (GPSC or strain lineage) 2 significantly decreased, whereas serotypes 6B, 9V and 19A and GPSCs 1, 6, 10 and 23 significantly increased in proportion post-uptake of PCV. Resistance determinants to penicillin, erythromycin, co-trimoxazole, fluoroquinolones and tetracycline, and multidrug resistance significantly increased in proportion post-uptake of PCV and especially among VT isolates. Co-trimoxazole resistance determinants were common pre- and post-uptake of PCV (85 and 93 %, respectively) and experienced the highest rates of recombination in the genome. Accessory gene frequencies were seen to be changing by small amounts across the frequency spectrum specifically among VT isolates, with the largest changes linked to antimicrobial resistance determinants. In summary, these results indicate that as of 2020 this pneumococcal population was not yet approaching a PCV-induced equilibrium and they highlight changes related to antimicrobial resistance. Augmenting PCV coverage and prudent use of antimicrobials are needed to counter invasive pneumococcal disease in this region.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): antimicrobial resistance , population genomics , recombination , Streptococcus pneumoniae and vaccines
Funding
This study was supported by the:
  • Pfizer (Award 57039923)
    • Principle Award Recipient: VeeraraghavanBalaji
© 2024 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2024-02-05
2024-05-20
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Pneumococcal population genomics changes during the early time period of conjugate vaccine uptake in southern India
M Gen 10, 001191 (2024); https://doi.org/10.1099/mgen.0.001191
/content/journal/mgen/10.1099/mgen.0.001191
/content/journal/mgen/10.1099/mgen.0.001191
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