Omicron BA.2 Variant Pressures Parts of U.S.

The Omicron BA.2 variant is increasing its share of U.S. cases and putting particular pressure on parts of the Northeast, where wastewater readings and Covid-19 cases have ticked upward again from low levels.

Recorded Covid-19 cases remain low nationally and hospitals are treating the smallest number of Covid-19 patients after any surge. Places where cases are rising, including New York, are reporting relatively small increases from recent troughs. The mixed signals are prompting officials to warn that BA.2 will likely lead to more viral transmission, but also hope among public-health experts that warming weather and built-up immunity in the population are muting the variant’s impact.