After declining for months, U.S. coronavirus cases are rising again. Has the ‘fall wave’ begun?

In some previously hard-hit places — California, for instance — it’s almost certainly a byproduct of increased testing. In others, such as Texas, college outbreaks are a driving force. Meanwhile, a state like Wisconsin — where the average positive testing rate has soared from about 6 percent in early August to more than 17 percent today — seems to have a more widespread problem.

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