Indian authorities say capital Delhi and financial hub Mumbai have reported a big fall in Covid-19 infections in the past two days and most of those who contracted the virus have recovered at home, Reuters reports.

Both cities have said more than 80 per cent of their Covid-19 hospital beds have remained unoccupied since the fast-transmitting Omicron variant led to a massive surge in cases from the start of the year.

"With very large numbers of sub-clinical, asymptomatic and undetected cases, it is difficult to pinpoint a peak by new cases," Rajib Dasgupta, head of the Centre of Social Medicine & Community Health at New Delhi’s Jawaharlal Nehru University, said in an email.