As summer and peak travel season begins, a highly transmissible new COVID-19 variant called NB.1.8.1, or "Nimbus," is spreading in the United States. The mutated omicron subvariant, which caused surges in parts of Asia this spring, now accounts for more than one-third of cases in the U.S., new data show. ...
Although NB.1.8.1 is causing a rapidly increasing proportion of cases in the U.S., COVID trends — including test positivity and hospitalizations — remain stable. As of June 6, the level of COVID viral activity in wastewater is “low” nationally, according to the U.S. Centers for Disease Control and Prevention.
WHO director general Tedros Adhanom Ghebreyesus announced the extension of the emergency following a meeting of international experts who noted progress in some countries but also highlighted a surge in west Africa and the spread of the virus outside Africa.
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