W.H.O. officials, concerned about the Delta variant, urge vaccinated people to keep wearing masks.

By Roni Caryn Rabin, Abdi Latif Dahir and Aina J. Khan

World Health Organization officials, concerned about the Delta variant, have urged even fully vaccinated people to continue wearing masks and taking other precautions.

The Centers for Disease Control and Prevention, on the other hand, told fully vaccinated Americans in May that they no longer needed to wear masks indoors or to stay six feet from other people. The agency also eased advice about testing and quarantine after suspected exposure.

Asked on Monday about the W.H.O.’s cautions, a C.D.C. spokesman pointed to the existing guidance and gave no indication it would change.

The Delta variant, a highly infectious form of the virus that has spread to at least 85 countries since it was first identified in India, is now responsible for one in every five Covid-19 cases across the United States. Its prevalence here has doubled in the past two weeks, and Dr. Anthony Fauci, the nation’s top infectious disease doctor, has called it “the greatest threat” to eliminating the virus in the United States.

Los Angeles County said on Monday that it strongly recommended that everyone wear masks indoors as a precaution against the Delta variant, adding that it accounted for nearly half of all cases sequenced in the county.

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