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Prioritizing the elderly for COVID-19 boosters reduces overall deaths

August 8, 2024
in Biology
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Prioritizing the elderly for COVID-19 boosters reduces overall deaths
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When COVID-19 booster vaccines are in short supply, prioritizing the elderly over other age groups for booster vaccination results in the lowest loss of life, reports Robin Thompson at the University of Oxford and colleagues, in a new study published August 8 in the open-access journal PLOS Computational Biology.

When COVID-19 booster vaccines are in short supply, prioritizing the elderly over other age groups for booster vaccination results in the lowest loss of life, reports Robin Thompson at the University of Oxford and colleagues, in a new study published August 8 in the open-access journal PLOS Computational Biology.

Despite widespread vaccination against the virus that causes COVID-19, declining immunity and the emergence of new variants has resulted in continuing waves of infection and disease worldwide. Due to the cost of producing and administering booster vaccines, and insufficient supplies, policymakers must decide whether older individuals should be targeted to receive the boosters or whether other strategies are more effective at preventing premature deaths.

In the new study, researchers used mathematical modelling to address this question, taking into account the spread of the virus that causes COVID-19 in a range of countries with different socioeconomic backgrounds. They found that prioritizing older individuals for boosters consistently led to the best public health outcomes, regardless of a country’s economic level or the proportion of people in different age categories. The researchers looked at both the total number of deaths and “years of life lost,” a metric that accounts for premature deaths in younger individuals.

The study concludes that policymakers should prioritize older individuals for boosters when vaccine supply is limited because they face a much higher risk of death and other negative outcomes from infection. The researchers report that this recommendation holds true both for high-income countries, which tend to have more older individuals, and lower- or middle-income countries, which often have a higher proportion of young people. Additionally, this strategy is more effective than vaccinating individuals who have the most numbers of contacts, and works regardless of the timing and supply of the boosters.

Dr Thompson adds: “Prioritising older individuals for COVID-19 booster vaccination was projected to lead to the best public health outcomes in each country considered, regardless of the country’s income group.

This is because older individuals are substantially more likely to experience severe outcomes of infection than younger individuals. 

The benefits of targeting booster vaccines at older individuals outweigh any benefit that could be achieved by instead vaccinating younger individuals, even though younger individuals may contribute more to transmission.”

 

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In your coverage, please use this URL to provide access to the freely available article in PLOS Computational Biology:

Citation: Bouros I, Hill EM, Keeling MJ, Moore S, Thompson RN (2024) Prioritising older individuals for COVID-19 booster vaccination leads to optimal public health outcomes in a range of socio-economic settings. PLoS Comput Biol 20(8): e1012309.

Author Countries: United Kingdom

Funding: This research was funded by the World Health Organization through a grant from the SAGE Working Group on COVID-19 Vaccines (IB, EMH, MJK, SM, RNT). This grant included funding for IB’s salary for the duration of the project, and partially funded RNT’s and SM’s salary. EMH, MJK, SM and RNT acknowledge the support of the JUNIPER partnership, funded by MRC (grant number MR/X018598/1), to which they are linked. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.



Journal

PLoS Computational Biology

DOI

10.1371/journal.pcbi.1012309

Method of Research

Computational simulation/modeling

Subject of Research

People

COI Statement

The authors have declared that no competing interests exist.

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