There will always be questions about vaccine efficacy for variants - the vaccines teach the body to be ready for a particular virus that the body identifies by the proteins on the surface of the virus. If the new virus variant changes the proteins on the surface of the virus, it is a matter of chance whether these will spoil the ability of the body's immune system to recognise it. Some of the current vaccines (especially the mRNA ones) use proteins that the developers consider are essential to the virus's infection mechanism, so that any variant that uses the same mechanism will be attacked by the immune system. But, of course, this "consider" is not the same as "know". There is still a lot to learn about virus infection mechanisms!
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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