It’s possible a single dose of coronavirus vaccine might be enough to protect people who have recovered from a bout of Covid-19, National Institutes of Health Director Dr. Francis Collins said Thursday.
“It does look as if in those individuals, a single dose, basically it's a booster for them because they already had the infection, they already have some antibodies that may be sufficient and they may not need the second dose,” Collins told CNN’s chief medical correspondent Dr. Sanjay Gupta.
Collins said that the NIH is “trying to collect as much data as possible about that right now.”
But, overall, he said that a single dose strategy for everyone could result in unforeseen consequences. “Are those people who are in between first and second actually sitting ducks for getting infected?” Collins asked.
“Is that actually a way that we might encourage more mutations to happen because they're only partly protected? The virus has a chance to live a little longer in their system and pick up some changes," he said.
Collins said that until the data showed otherwise, the authorized two doses three to four weeks apart is the regimen that should be followed.