Covid-19 cases are ticking up as the BA.2 variant dominates, while hospitalizations remain stable. Experts believe immunity from vaccination and recent Omicron infections may help the U.S. avoid an anticipated major surge
has dominated new infections in the U.S. for weeks without setting off a major surge so far, raising hopes among some public-health experts that the nation might dodge a more significant hit.
BA.2 is in particular affecting the Northeast, where virus concentrations in wastewater are rising alongside reported infections in such places as New York, Washington, D.C., and Philadelphia. Concern about BA.2 prompted Philadelphia to restore an indoor-mask requirement and U.S. authorities to extend
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