Slaoui: Could be months before we know if COVID-19 transmission possible after vaccination | TheHill – The Hill
Operation Warp Speed's chief scientific adviser, Moncef Slaoui, said Sunday that it could be months before researchers know for certain if transmission of COVID-19 is possible from a person who has received the vaccine.
On CBS's "Face the Nation," host Margaret Brennan asked Slaoui when scientists will know if such transmission is possible, a key factor for determining when the U.S. will develop herd immunity to the virus.
"Do you have a date for when you will know whether once you've been vaccinated you can still give the virus to others?" asked Brennan.
"No," Slaoui responded. "Those studies, frankly, are going to be based on observational data into the population. I don't think we will have data before late in the spring."
Does #OperationWarpSpeed have a timeline of once ...