Yep, Pfizer recommends 21-28 day. Radio silence on the longer spacing out, I suppose why would they comment, they are just selling, it’s up to individual governments and CMO’s to apply the vaccine and roll out.
No, I suspect it’s a range of severity, but for me could be a few subjective factors at play. It takes approx 10 days post the first dose, to achieve Pfizer’s reported first dose of efficacy of 51% so there is a subjective variable there. The belief is though that the greater the efficacy the higher the anti body response, the less severe experience of the virus. The other thing is, in most countries they are not testing to see if someone has the virus or not before the vaccination, so arguably it could already be seeded, the incubation period for the virus and vaccine efficacy are similar. For example I got the vaccine Weds last week, I went for a routine COVID test before (we’re tested weekly in work anyway) I got the negative result of the test by text on Saturday, but made me think what if I was positive and unknowingly went and got the vaccine anyway, that’s sure to happen. There are a few holes in that report.
The take home for me, is that initial results are showing that the efficacy may be lower then the 51% after the first dose that Pfizer have reported, however the second dose is the accelerator dose that seems to reach the maximum consistent efficacy despite variable first dose efficacy probably needs more digging into though.
Overall though I’d be cautious of reports in mainstream as opposed to studies, you can see how easy it is to pick holes.