The WHO says fully vaccinated people should continue to wear face masks in public settings.
The statement comes amid concerns over the quickly spreading Delta variant of COVID-19.
"People cannot feel safe just because they had the two doses," a WHO official said.
The World Health Organization on Friday said that people should continue to wear face masks and take other measures meant to curb the spread of COVID-19, raising concerns about the quickly spreading Delta variant of COVID-19.
"People cannot feel safe just because they had the two doses. They still need to protect themselves," said Dr. Mariangela Simao, the assistant director-general for access to medicines and health products at the WHO, CNBC reported.
Masks have become less common in the US as it has returned largely to pre-pandemic norms following the ongoing vaccine rollout that began late last year.
In updated guidance, the Centers for Disease Control and Prevention in May said it wasn't necessary for fully vaccinated people to wear their masks in most indoor or outdoor settings. All 50 states quickly fell in line with the new guidance, eliminating mask requirements in most settings and scaling back other restrictions meant to prevent the spread of the virus
The threat of the variant is greatest among communities with low vaccination rates, experts have warned.
As Insider previously noted, it doesn't appear that the variant causes more severe cases of COVID-19, but it does appear to make the virus more transmissible. About 40 to 50% of Delta variant cases in Israel, which is seeing a surge, are among vaccinated people, Chezy Levy, the director-general of Israel's health ministry said earlier this week.