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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.

Bengaluru, Mar 27: Karnataka has recorded the third death due to the Covid-19 virus. It is a man from Tumakuru with a travel history to Delhi. He had been put in isolation at the District Hospital in Tumakuru on March 24.

His travel history indicates that he travelled to New Delhi by the Sampark Kranti Express (Coach S6) on March 5 along with 13 members. They reached Hazrat Nizamuddin station in New Delhi on March 7 and went to the Jamia Masjid and rented an room at a lodge nearby.

He began the return journey to Karnataka by the Kongu Express on March 11 in Coach no. S9. On March 18, he developed cough and fever and visited a private hospital the next day. He was referred to the District Hospital in Tumakuru but on March 24, he left the hospital against medical advice and went to a private medical facility. He was referred back to the District Hospital, where he was put isolation.

Bengaluru, Jun 6: Karnataka registered 378 Covid-19 cases in the past 24 hours, breaching the 5,000-mark to settle at 5,213, said an official, here on Saturday. "New cases reported from Friday 5 p.m. to Saturday 6 p.m. is 378," said a health official.

Of the new cases, 333 are local returnees, comprising 88 per cent of the new infections. Returnees from Maharashtra accounted for 99 per cent new cases at 329.

Majority infections in Karnataka nowadays are returnees, mostly from the state''s northern neighbour. Only 27 new infections were contacts of earlier cases.

On Saturday, cases spiked in Udupi, Kalaburagi, Yadgir, Bengaluru Urban, Belagavi, Vijayapura, Davangere and Dakshina Kannada.

Udupi witnessed the highest number of cases (121), followed by Yadgir (103), Kalaburagi (69), Dakshina Kannada (24), Bengaluru Urban (18), Vijayapura and Davangere (6 each), Belagavi (5), Gadag (4), Mandya, Hassan, Dharwad and Haveri (3 each), Raichur, Chikkaballapura and Uttara Kannada (2 each) and Bidar, Tumkur, Kolar and Koppal (1 each).

Among the new cases, three patients from Bengaluru Urban are suffering from Influenza Like Illness (ILI) and another from Severe Acute Respiratory Infection (SARI).

There were seven cases with international travel history to United Arab Emirates (UAE) and one to Turkey.

Meanwhile, 280 people were discharged in the past 24 hours and two persons succumbed to the virus, one from Bidar and another from Vijayapura. Of all the cases, 3,184 are active, 1,968 discharged, 59 dead and 11 in the ICU.

In the past 24 hours, Karnataka tested 11,862 people, of which 11,431 reports returned negative. In total, 3.72 lakh samples have been tested so far, of which 3.61 lakh have returned negative.

Currently, Udupi is leading the state''s Covid-19 burden with 785 active cases, followed by Kalaburagi (448), Yadgir (407), Raichur (320) and Mandya (163) among others.

Bengaluru Urban has accounted for 13 deaths, followed by Kalaburagi (7), Bidar, Vijayapura, Davangere and Dakshina Kannada (6 each) and Chikkaballapura (3 each), among others.