The Delta variant is spreading in the US, but the WHO, CDC and local governments have put out conflicting mask-wearing guidance. Here's what we know. RELATED: https://bit.ly/3qC9djT The World Health Organization has urged fully vaccinated people to continue wearing masks indoors and practice social distancing as the delta variant surges in many parts of the world. “People cannot feel safe just because they had the two doses. They still need to protect themselves,” said Dr. Mariangela Simao, WHO assistant director-general, during a news briefing Friday. » Subscribe to USA TODAY: http://bit.ly/1xa3XAh » Watch more on this and other topics from USA TODAY: https://bit.ly/2U9omx4 » USA TODAY delivers current local and national news, sports, entertainment, finance, technology, and more through award-winning journalism, photos, videos and VR.