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.
Across the United States, officials have dropped mask mandates and are closing mass vaccine and testing sites as new coronavirus cases have fallen nationally to about 27,000 a day on average. But several states — mostly in the Northeast — have had some increases in case numbers over the past two weeks, according to a New York Times database
LONDON — The prevalence of Covid-19 in the U.K. has reached record levels, with about 1 in 13 people estimated to be infected with the virus in the past week, according to the latest figures from Britain’s official statistics agency.
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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