One thing I don't understand is why we don't have a modified booster yet? The boosters being given are just a repeat of the vaccines given earlier in the year but they have always been less effective vs Delta.
This is especially true for the AZ vaccine which contains an Adenovirus and people not only gain antibodies against COVID but they gain antibodies vs the Adenovirus itself and so efficacy drops further.
Given the prevalence of the use of the AZ vaccine here, is this possibly why our cases are higher than anywhere else? It may also explain the ping pong of cases going on in Europe, for example Greece and Germany are seeing new case booms.
Waning immunity provided by coronavirus vaccines combined with the U.K.’s early reliance on the Oxford/AstraZeneca vaccine has contributed to the current spike in cases, which are close to reaching…
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