One chart shows how COVID-19 vaccines stack up against 4 worrisome variants, including the one found in India
https://www.businessinsider.com/cov...-variants-india-south-africa-brazil-uk-2021-5
Sixteen months into the pandemic,
half of all US adults have been vaccinated, and the number of new daily coronavirus cases has fallen
below 30,000 for the first time since June.
But infections involving worrisome coronavirus variants continue to pop up. Some of these mutated strains are more transmissible than earlier versions of the virus, while others can partially evade antibodies developed in response to prior infections. So concerns linger about how well the authorized COVID-19 vaccines work against these variants.
Earlier this year, lab studies exposed blood samples from vaccinated people to the variants first found in South Africa and Brazil. The
results showed that the samples generated fewer protective antibodies that could neutralize those variants than they did when exposed to the original virus.
But as more people get vaccinated, real-world data has started to trickle in from areas where these pernicious variants dominate. This offers a better look at
how well leading shots work at preventing symptomatic infections. And the results are promising: none of the variants that the Centers for Disease Control and Prevention and World Health Organization are monitoring can fully evade vaccines. Plus, reduced antibody responses haven't necessarily translated into poorer protection against infection.
The COVID-19 vaccines even seem to work against a group of variants discovered in India this winter, called B.1.617, which likely contributed to the country's coronavirus surge. Data from the UK government, obtained by
the Financial Times, suggest that two doses of the Pfizer or AstraZeneca vaccines offer
a high degree of protection against B.1.617.
The chart below summarizes what we know so far about how well five vaccines work to protect people from four of the most worrisome coronavirus variants.
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Comparing worrisome coronavirus variants
Countless versions of the coronavirus circulate worldwide, each separated by a small number of genetic mutations. Once a slew of mutations makes a particular strain better at infecting people, deadlier, or more able to evade the antibodies generated from a vaccine or previous infection, geneticists label it
a variant of concern.
There are four of these,
according to the WHO: B.1.1.7, the variant initially found in the UK in September; P.1, which was discovered in December; B.1.351, which was detected in samples from South Africa dating back to October; and B.1.617, a group of strains first spotted in India this winter.
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