- Thu Mar 10, 2022 4:49 pm
#21993
UK Covid cases rising among those aged 55 and over
Prof Paul Elliott, director of the React study, said the rise was probably driven by factors including the lifting of all Covid legal restrictions in England on 24 February, more mixing between age groups and waning protection from booster shots.
One idea experts are investigating is whether hospitalisation rates are being driven by “unshielding”, where people who have been extremely careful for two years have emerged into a world where infections are still rife.
Another driver is thought to be the BA.2 form of Omicron, a relative of the original BA.1. While BA.2 does not seem to evade immunity any more than BA.1 or cause more severe disease, it spreads faster and increases R by 0.4 compared with BA.1, the Imperial researchers found. “From what we see, BA.2 is more transmissible and may prolong the Omicron wave of the pandemic,” Elliott said. “It’s taking over, so that could explain higher infection rates.”