Equitable access to COVID-19 vaccines makes a life-saving difference to all countries

Yang Ye, Qingpeng Zhang (), Xuan Wei, Zhidong Cao, Hsiang-Yu Yuan and Daniel Dajun Zeng ()
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Yang Ye: City University of Hong Kong
Qingpeng Zhang: City University of Hong Kong
Xuan Wei: Shanghai Jiao Tong University
Zhidong Cao: Chinese Academy of Sciences
Hsiang-Yu Yuan: City University of Hong Kong
Daniel Dajun Zeng: Chinese Academy of Sciences

Nature Human Behaviour, 2022, vol. 6, issue 2, 207-216

Abstract: Abstract Despite broad agreement on the negative consequences of vaccine inequity, the distribution of COVID-19 vaccines is imbalanced. Access to vaccines in high-income countries (HICs) is far greater than in low- and middle-income countries (LMICs). As a result, there continue to be high rates of COVID-19 infections and deaths in LMICs. In addition, recent mutant COVID-19 outbreaks may counteract advances in epidemic control and economic recovery in HICs. To explore the consequences of vaccine (in)equity in the face of evolving COVID-19 strains, we examine vaccine allocation strategies using a multistrain metapopulation model. Our results show that vaccine inequity provides only limited and short-term benefits to HICs. Sharper disparities in vaccine allocation between HICs and LMICs lead to earlier and larger outbreaks of new waves. Equitable vaccine allocation strategies, in contrast, substantially curb the spread of new strains. For HICs, making immediate and generous vaccine donations to LMICs is a practical pathway to protect everyone.

Date: 2022
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DOI: 10.1038/s41562-022-01289-8

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