Mumbai's civic body chief Iqbal Chahal, citing experts, said that 80 per cent of Covid cases being reported are of the Omicron strain and the figure may soon touch 90 per cent. "I have been taking inputs of my experts in the State's Task Force... Their opinion is that Omicron is now 80% (of the Covid cases)... And this 80% also will touch 90% in the next few days; maybe it can touch in the next 5-7 days," said the civic body chief. On the aggressive rise in cases, the civic chief said, "Omicron is spreading in Mumbai mainly because of passengers coming from non-risk countries.