President Joe Biden believes that the U.S. could reach herd immunity by the summer. First, there has been disagreement over how the U.S. should reach herd immunity. Sure, with time it goes... And you’ll develop, you’ll develop like a herd (immunity). It’s going to be herd-developed, and that’s going to happen, that will all happen.”Former White House Press Secretary Kayleigh McEnany later stated, “Herd immunity (is) not a policy of the White House.”Another controversial issue when it comes to herd immunity is what percentage of the population needs immunity before herd immunity is reached. The WHO also gives polio as an example, which requires 80% of the population to be vaccinated to reach herd immunity.