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Maternal immunisation against Group B Streptococcus: A global analysis of health impact and cost-effectiveness

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  • Simon R Procter
  • Bronner P Gonçalves
  • Proma Paul
  • Jaya Chandna
  • Farah Seedat
  • Artemis Koukounari
  • Raymond Hutubessy
  • Caroline Trotter
  • Joy E Lawn
  • Mark Jit

Abstract

Background: Group B Streptococcus (GBS) can cause invasive disease (iGBS) in young infants, typically presenting as sepsis or meningitis, and is also associated with stillbirth and preterm birth. GBS vaccines are under development, but their potential health impact and cost-effectiveness have not been assessed globally. Methods and findings: We assessed the health impact and value (using net monetary benefit (NMB), which measures both health and economic effects of vaccination into monetary units) of GBS maternal vaccination in an annual cohort of 140 million pregnant women across 183 countries in 2020. Our analysis uses a decision tree model, incorporating risks of GBS-related health outcomes from an existing Bayesian disease burden model. We extrapolated country-specific GBS-related healthcare costs using data from a previous systematic review and calculated quality-adjusted life years (QALYs) lost due to infant mortality and long-term disability. We assumed 80% vaccine efficacy against iGBS and stillbirth, following the WHO Preferred Product Characteristics, and coverage based on the proportion of pregnant women receiving at least 4 antenatal visits. One dose was assumed to cost $50 in high-income countries, $15 in upper-middle income countries, and $3.50 in low−/lower-middle-income countries. We estimated NMB using alternative normative assumptions that may be adopted by policymakers. Conclusions: In this study, we found that maternal GBS vaccination could have a large impact on infant morbidity and mortality. Globally, a GBS maternal vaccine at reasonable prices is likely to be a cost-effective intervention. Simon R Procter and colleagues explore the global health impact and cost-effectiveness of maternal immunisation against Group B Streptococcus.Why was this study done?: What did the researchers do and find?: What do these findings mean?:

Suggested Citation

  • Simon R Procter & Bronner P Gonçalves & Proma Paul & Jaya Chandna & Farah Seedat & Artemis Koukounari & Raymond Hutubessy & Caroline Trotter & Joy E Lawn & Mark Jit, 2023. "Maternal immunisation against Group B Streptococcus: A global analysis of health impact and cost-effectiveness," PLOS Medicine, Public Library of Science, vol. 20(3), pages 1-20, March.
    • Handle: RePEc:plo:pmed00:1004068
    DOI: 10.1371/journal.pmed.1004068
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    References listed on IDEAS

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    1. Stavros Petrou & Natnaree Krabuanrat & Kamran Khan, 2020. "Preference-Based Health-Related Quality of Life Outcomes Associated with Preterm Birth: A Systematic Review and Meta-analysis," PharmacoEconomics, Springer, vol. 38(4), pages 357-373, April.
    2. Drummond, Michael F. & Sculpher, Mark J. & Claxton, Karl & Stoddart, Greg L. & Torrance, George W., 2015. "Methods for the Economic Evaluation of Health Care Programmes," OUP Catalogue, Oxford University Press, edition 4, number 9780199665884, Decembrie.
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