A seasonal rise in covid-19 cases in Europe and North America has focused attention on a group of variants called XFG, which has dominated worldwide over the past year. A string of covid-19 variants has arisen since the virus emerged in 2019, but do we need to be concerned every time we hear of a new strain? Or have our past covid-19 infections and vaccinations given us a baseline level of protection?
Source: NewScientist | Health
NewScientist
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