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People who live in areas with a higher rate of evacuation have a lower risk of dying from Covid-19.
This has been seen in a study published in The BMJ whose results, based on data from 2,558 counties of 48 US states, show that counties with high vaccine coverage had a more than 80% reduction in death rates compared to counties with largely unvaccinated counties.
This great benefit complements the individual benefits of vaccination against Covid-19.
Until April 11, 2022, more than 11,000 million doses of vaccine against Covid-19 have been administered worldwide and the goal of the World Health Organization (WHO) is to vaccinate 70% of the world population by mid-2022.
However, while previous studies on the vaccine have shown benefits at the individual level, the population-level impact of booster doses against Covid-19 remains largely unknown.
Now, researchers at the US Centers for Disease Control and Prevention (CDC). They have analyzed how the increase in vaccine coverage in the countries affected the mortality and incidence of covid-19 at the global level. population.
Their findings are based on more than 30 million cases of covid-19 and more than 400,000 deaths related to Covid-19 in 2,558 counties, which were reported during the second year of the pandemic, between December 2020 and December 2021.
They measured efficacy by comparing reported COVID-19 incidence and mortality rates in counties with very low (0-9%), low (10-39%), medium (40-69%), and high (40-69%) vaccination coverage. 70% or more), defined as the percentage of adults (over 18 years of age) who had received at least one dose of the Covid-19 vaccine.
After accounting for potentially influencing factors, the researchers found that increased vaccination coverage in counties was associated with reduced levels of COVID-19-related deaths and cases.
This is an observational study, so it cannot establish cause, and the researchers note that several limitations must be taken into account when interpreting these data. For example, they did not explore other markers of disease severity, such as hospital admissions, and did not control for factors such as mask-wearing and physical distancing regulations at the time, which may have affected their results.
However, the authors note that the results were similar after other sensitivity analyses, suggesting that they stand up to scrutiny. “Future research could benefit from evaluating the macroeconomic effects of improved population health, such as changes in employment rates and gross domestic product resulting from the reopening of society.”
This study adds to the evidence that vaccination can prevent infections and disease on a large scale, writes Professor Christopher Dye of the University of Oxford in an editorial.
“The findings of this study also make it clear that many more lives could have been and will be saved if people were encouraged to stay up-to-date with vaccination in the face of COVID-19. decreased immunity and new coronavirus variants and if an even greater population coverage is achieved, ”he adds.
“How many lives is a question for others to explore. In the meantime, this new study is another confidence booster for Covid-19 vaccines », she concludes.
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