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A new study shows the duration of natural immunity and risk of reinfection in endemic settings.
COVID-19: How Long Natural Immunity May Last? Millions of people have already been vaccinated against COVID-19 While scientists have discovered this and that about vaccine protection, data on natural immunity remains little So, it begs this question: how long does natural immunity last?
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According to Our World in Data, 47.8% of the world’s population has received at least one dose of a COVID-19 vaccine However, only 2.8% of people in low-income territories have received at least one dose The issue in vaccine distribution is still a big challenge
Between vaccinated and unvaccinated, many studies have shown that those who are protected have a reduced risk of severe COVID and hospitalization Though they need to maintain social distancing and keep wearing masks for extra protection After all, no vaccine can give perfect protection That imperfection also led to waning protection
Thus, we are hearing more about boosters But what about those who naturally got infected and survived COVID-19? Are they protected and how long does the protection last? A study in The Lancet Microbe probed into it
Researchers at Yale School of Public Health and the University of North Carolina at Charlotte analyzed the genes of 177 coronaviruses, which are known to infect humans Next, they sought the closest kin of SARS-CoV-2 Five came out, which included SARS-CoV-1, MERS-CoV, and others that cause the common cold
Then, they examined available data on antibody level decline over time, from 128 days to 28 years after infection After that, they looked into the risk of reinfection at different antibody levels Researchers predicted that natural immunity from SARS-CoV-2 infection would likely last less than 50%, compared to immunity from contracting related coronaviruses
Unvaccinated people with natural immunity were at risk of reinfection as soon as three months after the first encounter The average chance of reinfection was 16 months in endemic conditions “As new variants arise, previous immune responses become less effective at combating the virus,” said study co-lead author Alex Dornburg told Medical News Today
While the study has limitations, it is obvious that natural immunity isn’t enough with variants around Vaccines, social distancing, face masks, and proper hygiene are what we can do to keep these coronaviruses at bay Do you agree with the study findings? Did you know someone who got reinfected by SARS-CoV-2?
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