Public health experts reacted with alarm Wednesday to new Covid-19 testing guidelines issued by the Centers for Disease Control and Prevention, guidance that they said will make it harder to find and isolate people spreading the SARS-2 virus early and will undermine efforts to control transmission.

The guidance recommends against testing people who have been in contact with confirmed Covid-19 cases but who don’t yet have symptoms — even though such people can be infectious. It was crafted not by the CDC but by the White House coronavirus task force, and the nation’s best-known infectious disease expert, Anthony Fauci, didn’t sign off on it….

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