Covid-19 Reinvades U.S. States That Beat It Back Once (2)

The first U.S. states to endure the coronavirus this spring hoped the worst would be behind them.

Instead, the virus is coming back.

Many places that suffered most in the first wave of infections, including California, Louisiana, Michigan and Washington state, are seeing case counts climb again after months of declines. It’s not just a matter of more testing. Hospitalizations and, in some places, deaths are rising, too.

The disease is raging -- Florida reported 15,300 cases Sunday, the biggest single-day increase of the U.S. pandemic -- and experts say the resurgence in the original battlegrounds has common causes. They ...