![]() ![]() “As AY.4.2 is still at fairly low frequency, a 10% increase in its transmissibility could have caused only a small number of additional cases. The subvariant was “rare” outside Britain and there had been only three cases detected so far in the United States, he added. SPIKE MUTATIONSįrancois Balloux, professor of computational systems biology at University College London, said AY.4.2 has two spike mutations found in other coronavirus variants and was first sequenced in April 2020. Downing Street has acknowledged the rising numbers of positive tests, hospital admissions and deaths, but pointed to fluctuations in all three rates in recent months. ![]()
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