Omicron may raise re-infection risk; booster protection documented

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Survivors of previous infection with the virus that causes COVID-19, known as SARS-CoV-2, may be at higher risk for re-infection with the Omicron variant than with earlier versions of the virus, according to preliminary findings.

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Survivors of previous infection with the virus that causes COVID-19, known as SARS-CoV-2, may be at higher risk for re-infection with theIn South Africa, wherewas first reported, researchers reviewed data on nearly 2.8 million infections and saw that while the risk of a first infection rose when the earlier Beta and Delta variants spread during the pandemic’s second and third waves, the risk of re-infection was low and did not change.

The odds of testing positive for the coronavirus were much lower in adults who received a third dose of the vaccine than in people who got their second dose more than five months ago, the data showed. Overall, 1.8% of tests were positive in the booster group, versus 6.6% among those with only two doses, the researchers reported last week in the

The vaccine’s waning of protection over time “seems to be counteracted in the short-term by a third dose,” but longer monitoring is needed to see how long the protection will last, the researchers said.

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