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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.

Udupi, May 23: Five more persons tested positive for coronavirus in the coastal district of Udupi today. 

They include three men aged 37, 55, 31 and two women aged 48 and 34. 

Among them four are returnees from Mumbai and one is foreign returnee.

With this the total number of covid-19 cases in the district rose to 55.

Bengaluru, Jun 15: A total of over 4,000 COVID patients have been discharged in Karnataka so far, as the state on Monday reported 213 new cases of coronavirus and two related fatalities, taking the total number of infections to 7,213 and the death toll to 88.

On Monday alone 180 patients were discharged in the state after recovery. As of June 15 evening, cumulatively 7,213 COVID-19 positive cases have been confirmed in the state, which includes 88 deaths and 4,135 discharges, the health department said in its bulletin.

Out of the 2,987 active cases, 2,931 patients are in isolation at designated hospitals and are stable, while 56 are in Intensive Care Units. Among the two deaths were a 65-year-old man from Dharwad, who was the contact of another patient already tested positive.

He was admitted on June 14 at a designated hospital and died the same day. The other was a 75-year-old woman from Bengaluru, diagnosed with ILI (Influenza Like Illness) A known case of Diabetes mellitus and Hypertension , she was admitted on June 13 at a designated hospital and died on June 15.

Out of 213 new cases 103 are returnees from other states, a majority of them from neighbouring Maharashtra, while 23 are those who returned from other countries.

Among the districts where the new cases were reported, Kalaburagi accounted for 48, followed by Bengaluru urban 35, Dharwad 34, Dakshina Kannada 23, Raichur 18, Yadgir 13, Bidar 11, Ballari 10, Koppal 4, three each from Vijayapura, Bagalkote and Shivamogga, two each from Udupi, Haveri and Ramanagara, and one each from Hassan and Davangere.

Udupi district tops the list of positive cases with a total of 1,028 infections, followed by Kalaburagi 944 and Yadgir 822.

Among discharges also Udupi is on top with total of 736 discharges, followed by Kalaburagi 459 and Bengaluru urban 329. A total of 4,49,331 samples have been tested so far, out of which 5,362 were tested on Monday alone.

So far 4,32,346 samples have been reported as negative, out of which 4,738 reported negative today, the bulletin said.