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The deadly coronavirus that entered India while there was still nip in the air has beaten rising mercury, humid conditions, unique Indian genome and has entered monsoon season with more potency as fresh cases are only breaking all records in the country.

India recorded a single-day spike of record 24,850 new coronavirus cases on Sunday, taking its total tally to 6.73 lakh corona-positive cases.

Top Indian microbiologists were hopeful in March that after the 21-day lockdown, as summer approaches, the rise in temperature would play an important role in preventing the drastic spread of COVID-19 virus in India.

Several virologists hinted that by June this year, the impact of COVID-19 would be less than what it appeared in March-April.

The claims have fallen flat as the virus is mutating fast, becoming more potent than ever.

According to experts, the novel coronavirus is a new virus whose seasonality and response to hot humid weather was never fully understood.

"The theory was based on the fact that high temperatures can kill the virus as in sterilisation techniques used in healthcare. But these are controlled environment conditions. There are many other factors besides temperature, humidity which influence the transmission rate among humans," Dr Anu Gupta, Head, Microbiologist and Infection Control, Fortis Escorts Heart Institute, told IANS.

There is no built-up immunity to COVID-19 in humans.

"Also, asymptomatic people might be passing it to many others unknowingly. New viruses tend not to follow the seasonal trend in their first year," Gupta emphasized.

Globally, as several countries are now experiencing hot weather, the World Health Organization (WHO) reported a record hike in the number of coronavirus cases, with the total rising by 2,12,326 in 24 hours in the highest single-day increase since COVID-19 broke out.

So far over 11 million people worldwide have tested positive for the disease which has led to over 5,25,000 deaths, according to data from Johns Hopkins University. The US remained the worst-hit country with over 28 lakh cases, followed by Brazil with 15.8 lakh.

According to Sandeep Nayar, Senior Consultant and HOD, Respiratory Medicine, Allergy & Sleep Disorders, BLK Super Speciality Hospital in New Delhi, whether temperature plays a role in COVID-19 infection is highly debated.

One school of thought said in the tropical regions of South Asia, the virus might not thrive longer.

"On the other hand, another school of thought has found that novel Coronavirus can survive in a hot and humid environment and tropical climate does not make a difference to the virus. According to them, this is what distinguishes the novel coronavirus from other common viruses, which usually wane in hot weather," stressed Nayar.

Not much has been studied in the past and no definite treatment or vaccine is available to date.

"Every day, new properties and manifestation of the disease come up. As of now, the only way to prevent this monster is by taking appropriate precautions. Hand hygiene, social distancing, cough etiquette and face masks definitely reduce spread of COVID-19 infection," Nayar told IANS.

Not just top Indian health experts, even Indian-American scientists had this theory in mind that sunshine and summer may ebb the spread of the coronavirus.

Ravi Godse, Director of Discharge Planning, UPMC Shadyside Pennsylvania in the US told IANS in April: "In the summer, the humidity can go up as well, meaning more water drops in the air. If the air is saturated with water and somebody sneezes virus droplets into such air, it is likely that the droplets will fall to the ground quicker, making them less infectious. So the short answer is yes, summer/sunshine could be bettera.

According to Dr Puneet Khanna, Head of Respiratory Medicine and Pulmonology, Manipal Hospital, Delhi, COVID-19 death rates are not too different in tropical countries but since the disease affected them late it was yet to show its peak in these areas.

"The virus can survive well in hot and humid countries and this is proven now," he stressed.

New Delhi, May 3: The Indian Council of Medical Research (ICMR) has crossed over one million RT-PCR tests for COVID-19 on Saturday evening marking a big landmark, ICMR officials said.

"We have tested about 10,40000 tests till Saturday evening. In a few days, we have increased our testing capacity. ICMR has been doing more than 70,000 tests in the last two consecutive days," he said.

On Saturday, ICMR released that a total of 976363 samples have been tested till date. From May 1 till evening on Saturday, 1,37,346 tests were done.

The top three states which are doing vigorous testing includes--Maharashtra, Tamil Nadu and Rajasthan. As on date, these three states have conducted more than one lakh test respectively.

However, Andhra Pradesh, Uttar Pradesh, Karnataka and Delhi still need to ramp up their testing capacity.

ICMR has always emphasised that the confirmatory test for diagnosis of COVID-19 infection is RT-PCR test of the throat and/or nasal swab, which detects virus at an early stage. Recently, Dr GS Toteja, Additional Director General of ICMR had said that to contain coronavirus infection, RT-PCR tests must be continued vigorously as the principal diagnostic tests.

RT-PCR tests are now available in 310 government laboratories and 111 private set up across the country.

On Friday, the Centre informed that ICMR has ordered 21.35 lakh diagnostic kits. As on date, India has reported about 37,776 confirmed coronavirus cases and 1223 deaths.

Bengaluru, May 1: As Mumbai link surfacing in some COVID-19 cases in Mandya district in Karnataka, JDS leader and former chief minister H D Kumaraswamy on Friday blamed the district administration for the situation, accusing it of not quarantining 7,000 labourers who 'returned' from the Maharashtra capital.

"The information we have is that there are about 16,000 labourers from Mandya were working in Mumbai of which 7,000 people reached the district. None of them was quarantined properly," Kumaraswamy told reporters in Bengaluru.

He claimed the district, a stronghold of JDS, was staring at a major spurt in cases due to the careless attitude of the district administration. "Government should initiate action against those who are responsible for the laxity," he said.

However, he did not specify when the 7,000 workers returned to Mandya. When asked about Kumaraswamy's claim, officials said they have to verify it. Of the eight cases reported from Mandya on Friday, three had a travel history to Mumbai, a major COVID-19 hotspot in the country, officials said.

A Health Department official said four of the fresh cases were contacts of a patient who tested positive on April 8 and admitted to a hospital. After weeks of coming in contact with him, the four were confirmed for COVID-19, an official said. The Three people with travel history to Mumbai had, in fact, brought the body of a man who died of a heart attack there on April 24, the official added.