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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.

Mangaluru, July 21: Putting an end to all speculations, district in charge minister Kota Srinvas Poojary on Tuesday said that the lockdown in Dakshina Kannada will not be extended beyond Wednesday.

In a video message, the minister said that all the shops in the district will remain open from July 23 morning. He said district administration will make a formal announcement soon.  

Meanwhile chief minister B S Yediyurappa said: “There’ll be no lockdown from Wednesday, people need to get back to work, economy is also very important. We have to fight COVID-19 while maintaining stable economy. Lockdown is not the solution, now restrictions will be placed only in containment zones.”

Bengaluru, Jun 26: Karnataka recorded 445 new Covid cases, majority of whom were contacts of earlier positive cases, breaching the 11,000 mark to settle at 11,005, an official said on Friday.

"New cases reported from Thursday 5 p.m. to Friday 5 p.m., 445," said a health official on Friday.

In the past 24 hours, 10 patients succumbed to the virus in Karnataka, three in Bengaluru Urban and one each in Kolar, Dharwad, Shivamogga, Bagalkote, Bidar, Kalaburagi and Ballari.

Like everyday, contacts of earlier cases outnumbered domestic returnees in the number of infections, constituting 39 per cent.

Positive cases with domestic travel history numbered 65, a mere 15 per cent and majority to Maharashtra.

There were also 21 cases with international travel history to countries like Oman, Qatar, Saudi Arabia and Dubai.

On Friday, cases spiked in Bengaluru Urban, Ballari, Kalaburagi, Koppal, Dakshina Kannada, Dharwad, Raichur, Gadag, Chamarajanagar, Udupi, Yadgir, Mandya, Uttara Kannada, Bagalkote, Shivamogga, Kolar and Mysuru.

Among the new cases, Bengaluru Urban accounted for 144, followed by Ballari (47), Kalaburagi (42), Koppal (36), Dakshina Kannada (33), Dharwad (30), Raichur (14), Gadag (12), Chamarajanagar (11), Udupi (9), Yadgir (7), Mandya, Uttara Kannada, Bagalkote, Shivamogga and Kolar (6 each).

Mysuru (5), Chikkamagaluru and Kodagu (4 each), Hassan and Bengaluru Rural (3 each), Vijayapura, Tumkur and Haveri (2 each) and Bidar, Belagavi, Davangere, Ramanagara and Chitradurga (1 each).

As many 144 patients are suffering from Influenza-like Illness (ILI) and 19 from Severe Acute Respiratory Infection (SARI).

In all, 5.68 lakh samples have been tested so far, of which 5.41 lakh tested negative.

Meanwhile, 178 patients are admitted in the ICU.

Of the total 180 deaths, Bengaluru Urban has accounted for 81, followed by Bidar (16), Kalaburagi (15), Ballari (9) and Dakshina Kannada (8), among others.