BA.2 infections aren’t as mild as once thought and now even newer versions of Omicron are circulating and spreading fast
. A team led by Kei Sato, a virologist at the University of Tokyo, created a synthetic version of BA.2 in the lab, and found that it grows faster in cells lining the nasal passage and has greater propensity to attack the lungs. This BA.2 look-alike virus alsoThe research suggests that mutations in BA.2’s spike protein—the part of the virus that binds to cells—enable it to dodge antibodies from a previous BA.1 infection.
“In Hong Kong, and right now in Shanghai, I don't think [BA.2] is as mild as maybe people thought,” says Cowling.Available data show that the currently approved vaccines will prevent severe infection and hospitalization from COVID-19,Both Denmark and South Africa currently have high levels of immunity in their populations stemming from vaccination and infection, respectively. But data from both countries has shown there’s not much difference in severity between BA.2 and BA.1 infections.
, although in highly vaccinated Denmark, it was rare and mainly affected younger unvaccinated individuals.
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