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New Delta subvariant AY.4.2 spreads fast in UK, US, Russia, Israel: Everything you need to know
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New Delta subvariant AY.4.2 spreads fast in UK, US, Russia, Israel: Everything you need to know

Experts say that given how the Delta variant has predominated samples of Covid-19 globally for more than six months, it was seen as an indication that the novel coronavirus had reached its “evolutionary limit".