Dr. Anthony Fauci said he did not have a “firm answer” when asked if natural immunity offered better protection from COVID-19 than the vaccine.

Fauci, who is President Joe Biden’s chief medical adviser, was asked on Friday by CNN’s Dr. Sanjay Gupta whether people who have tested positive for the virus should still get a shot. He cited data from Israel in August suggesting people who recovered from COVID-19 had a lower risk of contracting the delta variant than those who got a full Pfizer vaccine.

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Why aren’t we talking about natural immunity?