It’s hard to say exactly what’s going on, given the hugely complex nature of (human) physiology. Still, the correlation is extremely strong, and that’s usually only the case with the most dominant of factors, so it’s quite reasonable to hypothesise a causal relationship and then probe and test this to see if any countermanding evidence can be adduced—i.e., apply the usual scientific approach to winnow out what’s going on. So, it could well be indirectly causal (rather than directly) in that it’s not an upgraded immune response to the virus itself by the body as cultivated by the vaccine, but that the transmission mechanism is altered in some non-obvious way by it, or that the virus’ ability to cause damage is subtly impaired by the presence of a different immune response to a different but associated factor in vaccinated individuals. Perhaps the most baffling aspect at present is that TB is caused by a bacillus, whereas COVID-19 is caused by a virus, and their disease-causing mechanisms are fundamentally different.
The only certain things in all of this are (1) that a better understanding of the virus will emerge from these studies, and (2) it’ll be a while yet before the threat can be eliminated. That means no early release from lockdown (unless you happen to be a self-important government functionary with delusions of invincibility, of course).
'Luthon64
"Sensitive" people are now carefully examining the entire universe, trying to find something to be "offended" at. It won't stop until such time as the "offenders" learn to stop apologizing, and saying "freck off" instead. — brianvds, The ShoutBox Classics, 02/07/2018.