Isolating from mean people
Usually, it’s just a doctor’s certification. The health system in the US is VERY fragmented. For example, my primary doctor’s system can’t talk to my ophthalmologist’s system because they belong to different hospital systems.How does this work with flu shots? I read they are mandatory in some places in the US?
As for the 2nd shots, I got a little card when I got my first and it has the site name and vaccine name on it. They warn you to keep the card in a safe place.