Rates of confirmed Omicron-related COVID infection and severe disease were lower after a fourth dose of the Pfizer-BioNTech vaccine, according to real-world data from Israel, although protection against confirmed infection seemed short-lived.
Hybrid immunity from a COVID-19 infection plus a vaccine provided an immune boost against symptomatic disease, as well as severe outcomes, Brazilian researchers found.
A study published on Thursday found that pregnancy nearly doubles the risk of breakthrough COVID-19 cases, closely followed in risk by a solid organ transplant.
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