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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 25: In what is suspected to be the second COVID-19 death in Karnataka, a 70-year-old woman from Gouribidanuru, who was under house quarantine for the last one week has died at Rajiv Gandhi Hospital for Chest Diseases.

The woman, who had recently returned from the Mecca pilgrimage developed fever on Tuesday afternoon. She was rushed to hospital, where she died on Wednesday morning.

Health and Family Welfare officials said that the throat swab sample of the woman had been sent to the laboratory for testing and the result was expected to come by afternoon.

Since last week, at least three cases of COVID-19 positive had been reported in Gouribidanuru in Chikkaballpura district, about 80 kms from Bengaluru.

Most of the suspects and confirmed cases had returned from Makkah pilgrimage. Even the deceased woman was one of them and had been advised house quarantine.

On Tuesday morning, she developed fever and was shifted to Gouribidanur hospital and later to Chikkaballapura hospital. By evening, she was moved to Rajiv Gandhi hospital, where she died on Wednesday morning.

The Chikkaballapura district administration has proclaimed prohibitory orders in the locality. They have also taken the woman's family members for testing.

Bengaluru, Jul 10: With 2,313 more people testing positive for coronavirus in Karnataka in the last 24 hours, its overall tally of patients rose to 33,418 on Friday, health officials said.

57 patients died in Karnataka in the last 24 hours, with majority (27) of them from Bengaluru, taking the state''s death toll to 543, the officials added.

Bengaluru accounted for 1,447 or 63 per cent of the new COVID-19 cases, spiking its tally to 15,329, out of which 11,687 are active cases.

The city alone accounts for 46 per cent of all the cases in the state.

As many as 45 deaths had Severe Acute Respiratory Infection (SARI) as a common symptom.

Among the new cases, excluding Bengaluru, Dakshina Kannada accounted for 139 infections, followed by Vijayapura (89), Ballari (66), Kalaburagi (58), Yadgir and Mysuru (51 each) among others.

On Friday, a record 1,003 patients got discharged, 601 of them in Bengaluru alone with the total number of discharges rising up to 13,836.

Until now, Karnataka has tested 7.79 lakh samples for Covid, out of which 7.28 lakh tested negative.

Despite the record number of discharges, patients in ICU rose to 472.

Of the 33,418 cases, 19,035 are active in the state.