Health
Why vaccinated people may still be able to spread Covid-19 – BBC News
There’s no evidence that any of the current Covid-19 vaccines can completely stop people from being infected – and this has implications for our prospects of achieving…
Herd immunity is the indirect protection from an infectious disease that populations acquire when enough people are immune. The threshold needed to achieve it depends on many different factors, such as the reproduction number of the virus, or “R” the number of further people infected by each carrier which itself varies widely. Some factors that affect the latter include where in the world you live, the variant involved, and the conditions on the ground, such as lockdowns.
This means that, even when…
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