He said the virus will evolve with time and "may become weak or strong, anything is possible”.
Most viruses tend to become less deadly after mutations, he added. The number of people getting vaccinated in the coming months will also determine how severe the situation will be, he said.
Dr N K Ganguly, the former head of the Indian Council of Medical Research, however, said the capital might have "hit the peak already" of this wave of coronavirus.
"The cases will start coming down next week. Similar trends (positivity rate and death rate) were witnessed in the US when it was grappling with the second wave of Covid-19," he said.
Dr Ganguly said several superspreader events, including the Kumbh, farmers' protests, weddings and election rallies, led to the present situation in Delhi and elsewhere.
The mutant virus is attacking children and younger populations in larger numbers, he said.
Delhi recorded over 25,500 cases on Sunday, the highest single-day tally since the pandemic began ravaging countries.