NEW DELHI, Apr 15 (AFP) — India's daily coronavirus caseload has doubled in ten days, with more than 200,000 new infections logged Thursday as authorities grapple with shortages of vaccines, treatments and hospital beds.

Having let its guard down with mass religious festivals, political rallies and crowds at cricket matches, India is experiencing a huge second wave, with almost two million fresh infections this month alone.

This week, it overtook Brazil to become the country with the second-highest number of cases worldwide.

In the past day it also recorded over a thousand deaths, health ministry data showed, taking its total to 175,000, although on a per capita basis India is far behind many other countries.

After a lockdown a year ago caused widespread misery and one of the sharpest downturns of any major economy, the central government is desperate to avoid a hugely unpopular second shutdown.

But many states are tightening the screws, in particular Maharashtra and its capital Mumbai, which this week introduced tougher restrictions for its 125 million people.

This has prompted many migrant workers to flee Mumbai and other cities in the state, in scenes reminiscent of the exodus from Indian towns and cities a year ago when the government halted all activity almost overnight.

Hospitals around India are now struggling to cope, running short of beds, oxygen and coronavirus medicines like remdesivir.

The government on Wednesday postponed high school exams for 15 to 18-year-olds, which were to be held in May and June, amid the resurgence of the virus.

India's drive to vaccinate its 1.3 billion people has also hit obstacles, with just 114 million shots administered so far and stocks running low, according to local authorities.

The government has also put the brakes on the Serum Institute — the world's largest maker of vaccines by volume — exporting to other countries. 

Poorer countries, as well as some rich nations, have relied heavily on Serum for supplies of the AstraZeneca vaccine, but last month New Delhi told the institute to prioritise domestic needs.

The ongoing religious festivals include the Kumbh Mela in Haridwar in northern India, which has seen millions of Hindu pilgrims — mostly without masks — massing on the banks of the holy Ganges river.

The virus was detected in more than 1,000 people in just 48 hours in Haridwar, officials said Wednesday.

"Our faith is the biggest thing for us. It is because of that strong belief that so many people have come here to take a dip in Ganga," Siddharth Chakrapani, a member of one of the Kumbh Mela organising committees, told AFP.

"They believe that Maa (mother) Ganga will save them from this pandemic."