Pursuing equitable access to vaccines for the next epidemic

Area of Science:

• Epidemiology
• Public Health
• Mathematical Modeling

Background:

• Global COVID-19 vaccination efforts began in late 2020.
• Unequal vaccine distribution favors affluent nations, exacerbating global health disparities and prolonging the pandemic.
• Emergence of new viral variants is linked to pandemic duration and unequal vaccine access.

Purpose of the Study:

• To investigate the relationship between pandemic duration and vaccine distribution timing.
• To analyze the impact of vaccine sharing between countries with migratory connections.
• To assess the benefits of equitable vaccine distribution on global pandemic mitigation.

Main Methods:

• Utilized a pair of coupled susceptible-infected-recovered-deceased (SIRD) models.
• Incorporated vaccination data into the epidemiological models.
• Simulated scenarios to evaluate the effects of different vaccine distribution timings.

Main Results:

• Demonstrated that prompt vaccine sharing significantly reduces pandemic duration for all involved nations.
• Showed that timely vaccine distribution is beneficial irrespective of viral variant emergence.
• Quantified the positive impact of collaborative vaccine strategies.

Conclusions:

• Equitable and timely vaccine distribution is crucial for effective global pandemic control.
• International cooperation in vaccine sharing benefits both donor and recipient countries.
• The study highlights that altruism in vaccine distribution aligns with national self-interest by shortening the pandemic.