U.S. President Joe Biden said Friday that social media networks are "killing people” by allowing the spread of misinformation about coronavirus vaccines.

"Look, the only pandemic we have is among the unvaccinated,” Biden said after he was asked about his message for tech companies as he departed the White House on Friday. "And they’re killing people.”

Biden’s comments came shortly after the head of the U.S. Centers for Disease Control and Prevention said the U.S. is seeing a "pandemic of the unvaccinated” in parts of the country where inoculation rates are low. Just four states accounted for 40% of COVID-19 cases in the past week, and the seven-day average of new infections is now up 70% from the previous week, with 26,300 new infections a day, U.S. officials said.