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.
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