Immunity through vaccination was always expected to wane.
Although it is also possible something else is at play here. The apparent drop in effectiveness could be related to the fact people are likely to be repeatedly exposed to the virus as time passes, increasing the opportunities for the virus to break through the immune system’s defences.
Either way this illustrates, once again, why we need to get used to Covid circulating.
Experts have been clear we should expect to be infected repeatedly over our lifetimes.
But each reinfection should be milder than the previous one.
And, for most, even those early infections will be milder than they would have been, because the vaccines remain highly effective at preventing serious illness.
The “good news”, Prof Adam Finn, of the Joint Committee on Vaccination and Immunisation (JCVI), says, is the vaccines, having effectively taken the edge off the virus by giving our immune system a head start, are still working very well.
The theory at the moment