Quote Originally Posted by blue matt View Post
In the USA its a 3 week gap then no later than another 2 weeks

a friend of ours ( in orlando, so it might differ from state to state ) has just had his 2nd, i said it is only a few weeks sine your 1st, which the reply was thats the US guidelines
The recommended gap between mRNA (Pfizer ad Moderna) vaccines is 4 weeks. This is what the CDC has in its directives. This was the regimen used during the vaccine testing phases. It's the same across all states. There may be some variation across states based on the roll outs.

I think the UK change to an 8 week gap for AZ was based on trying to get a first shot out to as many as possible and not based on the clinical trials (which I think was 4 weeks).