Right. Campbell tends to read a lot of research, and also probably find less visible or obscurely titled research ordinary reporters would not find, so I tried to find the video I'd seen Campbell's saying that, but he has a new one every day and I didn't find that particular one when I listened to 3 yesterday. So, there may be some research, but all I have is news articles at the moment. If you've read various research news over the last couple of years, you will at times find topics where you can get competing claims, of course.
An obvious one is masks -- where just like this question of optimum interval, there is complexity, and plenty will speak up without nuance or even noticing what's at issue, so you get all these useless articles that don't get to the real question around. For masks the real questions were things like what level of masking is the best compromise between what's practical and what works for what level of immune vulnerability and so on, rather nuanced and detailed. But we got endless claims at at simplistic level about 'masks work' (which is true and very useful) and 'masks don't work' (which is misleading and can be deadly for some) where the latter were clueless about the difference between preventing 100% of spread vs greatly reducing the
quantity of spread, etc.
So, merely that someone says (the not even disputed) point that a 4th booster can boost immunity, for example, that doesn't tell us anything much for what I want to know.
Of course it will. But
how soon is a meaningful statistically likely gain available?....(I want more than the overly simplified rule that fails to distinguish what different groups need)
We want to know how long an interval is optimum, and whether or not there are complicating factors or such, etc., even if we can't find all we want to know. Anyway, here is the disputed idea in a link below, but.... On the other hand one could try an entirely different angle altogether, like how long does effective immunity against serious illness last from what immune stimulation (like a natural infection, etc.) for what group. That's a different angle you could try. The bit I heard, which you ought to research on your own for your own particular unique situation, is for example (one case) if one has natural immunity from an omicron infection that seems (based on previous variants) likely to cause a meaningful level of immune response for about a year(ish) of time (which I think is for those not elderly and who have good immune function).
So, for the moment, until I find more, here's the topic in dispute, started by this viewpoint:
Frequent Boosters Spur Warning on Immune Response
And I don't know yet if it was only for this reason:
What’s the magic number for booster shots?
If you like to search for research stuff also and bring it here, the more the better!