I read the same thing for AZ but I couldn't find the source for this news, as this publication wasn't public yet.
If this behavior has ever seen before I couldn't confirm yet, usually it's indeed the opposite and requires a booster to improve immunity.
Mmmm... Then it would be 2 studies.
But it got me thinking.... a little paranoically...
You have Moderna and Pfizer with decreasing antibodies with the passing months...
You have J&J and AZ with (allegedly) increasing antibodies with the passing months...
But they're giving J&J and AZ recipients a dose of Pfizer or half a dose of Moderna after some months (>=3)...
For someone who got 2 doses of AZ and some months later one or half mRNA dose
or 1 dose of J&J and then some months later one or half mRNA dose
What will their antibody levels do ???
I assume they will increase, quite a lot compared with just the day before the booster, but after the initial boost ?
But what about 6 or 8 months after the boost ?
Will they increase because they got AZ or J&J in the beginning and they had the levels increasing already ?
Or will they decrease because they decrease after mRNA vaccines when a few months pass ?
Is there any chance the mRNA booster will result in people having fewer antibodies a few months down the road than those who didn't get a booster ?
I assume we haven't had time to test this yet, have we ? There are trials with boosters (at least in vitro), but I don't think they look at many months after the booster. They can't yet, can they ?
I guess it's just that I can't wrap my mind around a vaccine that causes someone to keep increasing antibody levels forever...