Even with the new COVID-19 vaccines, reaching herd immunity in the U.S. much before the end of the summer will be very difficult, President Joe Biden said in an interview with CBS News that aired Sunday.
To get to herd immunity, Dr. Anthony Fauci, Biden's chief medical adviser on the coronavirus pandemic, said 75 percent of Americans need to be vaccinated. In his first network interview of his presidency, Biden told Norah O'Donnell that the big sticking point to reaching that benchmark was the lack of a sufficient supply of vaccines.
The Trump administration's handling of the pandemic was "even more dire than we thought," Biden said.
"They had indicated there was a lot more vaccine available and it didn't turn out to be the case," he added.
Now, the administration must push to have more vaccines manufactured. Once that happens, Biden said he hopes to use all 32 National Football League stadiums for mass vaccinations.
About 20 million American children haven't been in classrooms for nearly a year and Biden said it's time to safely reopen schools.
"You have to have fewer people in the classroom. You have to have ventilation systems that have been reworked," Biden said. He also noted that "science-based" health guidelines for reopening schools will likely be presented this week.
More of the interview will air Monday.
Check out the video clips above and below:
A HuffPost Guide To Coronavirus
Is it safe to see people who have gotten the coronavirus vaccine?
What it means if your partner tests positive for COVID-19 but you don't.
How worried should you be about the new strains of coronavirus?
The unexpected challenges of co-parenting during a pandemic.
19 things we took for granted pre-pandemic but now miss.
Find all that and more on our coronavirus hub page.
As COVID-19 cases rise, it's more important than ever to remain connected and informed. Join the HuffPost community today. (It's free!)
Also on HuffPost
This article originally appeared on HuffPost and has been updated.