Voluntary use of masks must be promoted in the country in view of Covid-19's new XE variant, healthcare experts said, calling it the single-most effective intervention against all variants of the coronavirus. The World Health Organisation has issued a warning against XE, a new variant of Omicron first detected in the UK, and suggested that it could be more transmissible than any Covid strain so far.from India News | Latest News Headlines & Live Updates from India - Times of India https://ift.tt/Fjn8XyL