INDIA now has more than 500,000 confirmed coronavirus cases, according to government figures released Saturday (27) that showed a record daily leap of 18,500 new infections.
Authorities said a total of 15,685 people had died after another 385 fatalities were added to the toll in 24 hours.
The pandemic is not expected to peak in India for several more weeks and experts say the number of cases could pass one million before the end of July.
Some state governments are considering imposing new lockdowns. A hard-hitting nationwide lockdown that started March 25 is gradually being eased because of the damage caused to the economy.
The virus has particularly hit India's densely populated cities and there are now major concerns for New Delhi which has overtaken Mumbai with nearly 80,000 cases.
The city's government has predicted it will have 500,000 infections by the end of July. It is already using railway carriages to house patients and has taken over hotels and banquet halls to relieve the pressure on hard-pressed hospitals.
The government has been criticised over a lack of testing that experts say has hidden the true number of cases in India, which now stands at 509,000.
The country is currently fourth in the world for the number of infections, behind the US, Brazil and Russia, though it has a much lower death toll.
In a bid to boost tracing efforts, Delhi authorities have called in 33,000 health workers to screen about two million people in sealed off zones across the city of 20 million people.
But cities across the nation of 1.3 billion people are braced for a huge wave of new cases in coming weeks.
"It is likely that we're going into a state, unless we are able to reinforce a strict physical distancing mechanism or a hard lockdown, where the rate of infection will continue to increase," said Anant Bhan, a leading public health expert.
"Unlike China, where the pandemic was relatively more concentrated around Wuhan and a few other cities, India has a more diffused spread that makes it a bit more challenging for the healthcare system," he said.
Bhan said India might see several peaks in coming months because the spread of the virus "is variable across the country".
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