Health chiefs have revealed they are officially monitoring a new version of Covid-19 - which has been nicknamed "stealth Omicron". The UK Health Security Agency has marked BA.2 a "variant under investigation" - one level below a "variant of concern" - after early data suggested it may be both more transmissible and better able to evade vaccines than previous strains of the killer virus. It is a sub-lineage of the original Omicron - BA.1 - but appears to have certain differences that may make it both faster at spreading and harder to detect. According to the World Health Organisation ,…
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