AY.4.2, that has been detected in the United Kingdom. What is AY.4.2 sub-lineage? Matthew Bashton and Darren Smith, from Northumbria University in Newcastle, said that 75 AY lineages of the coronavirus have been identified till now, each with different additional defining mutations in their genome.
Talking about these in The Conversation, the duo said one of these variants - the AY.4 - has been steadily growing in proportion in the UK over the last few months, accounting for 63 per cent of new cases in the last 28 days.