Mixing and matching vaccines
Less clear at the moment is guidance about boosters for people who opted to mix and match their primary vaccine series.
“There was a mix-and-match study that was done which showed that in some cases, the mixing and matching … of an adenoviral record vaccine and an mRNA vaccine seem to give a very good immune response,” Dr. Marks said.
Once more data comes in on mixing and matching, “we’ll analyze them and then potentially make recommendations,” he said.
‘It’s not too late’
No federal government media briefing on COVID-19 would be complete without a plea for the unvaccinated to get immunized.
“We’re talking a lot about boosters right now, but it’s not too late for those who have not gotten a vaccine to get a vaccine,” Dr. Marks said, referring to the tens of millions of Americans who remain unvaccinated at the beginning of 2022.
“We know from our previous studies that even a single dose of the vaccine -- and probably two doses -- can help prevent the worst outcomes from COVID-19, including hospitalization and death.”
A version of this article first appeared on WebMD.com.