of Mississippi said he tested positive a third time. All reported being fully vaccinated, and Trudeau and Becerra said they’d gotten booster shots.
Also, the virus has evolved to be more contagious. The risk of reinfection has been about seven times higher with omicron variants compared with when delta was most common, research out of the United Kingdom shows. Scientists believe the omicron mutants now causing the vast majority of U.S. cases areat getting around immunity from vaccination or past infection, especially infection during the original omicron wave. U.S.
She got vaccinated with Pfizer in the spring of 2021 and thought she was protected from another infection, especially since she was sick before. But though such “hybrid immunity” can provide strong protection, it doesn’t guarantee someone won’t get COVID-19 again. The most recent illness was milder still, causing sinus pressure, brain fog, a woozy feeling and fatigue. That one, positive on a home test and confirmed with a PCR test, hit despite her Moderna booster shot.
Scientists don’t know exactly why some people get reinfected and others don’t, but believe several things may be at play: health and biology, exposure to particular variants, how much virus is spreading in a community, vaccination status and behavior. British researchers found people were more likely to be reinfected if they were unvaccinated, younger or had a mild infection the first time.
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