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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, Jun 11: Most COVID-19 deaths in Karnataka occur when infected elderly people, those with Severe Acute Respiratory Illness (SARI) or any other symptoms delay reaching designated hospitals, a top official said.

Munish Moudgil, chief of COVID-19 War Room in the state, said most of those infected with the virus are brought to COVID-19 designated hospitals at a very late stage and recovery then becomes extremely tough.

He said about 65 per cent of those killed suffered from SARI and are aged above 60.

The death rate due to SARI is 43 per cent for those in the 40-60 age group, he said, releasing data on coronavirus deaths, to reporters.

In the same age group, the mortality due to Influenza Like Illness (ILI) was 17.4 per cent, whereas it is 11.1 per cent among people aged above 60 .

He said 25 per cent of symptomatic patients aged above 60 die due to the virus, while it was 10.7 per cent in the 40-60 age group.

The fatalities among those aged 60 is high even if they are asymptomatic, Mr Moudgil, who is secretary in the Department of Personnel and Administrative Reforms, said.

He said the average number of days spent at these hospitals by those who recovered is about 15 days, compared to 3.5 days for those who died of the virus.

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"Hence persons who are elderly and who have comorbidities or who have SARI must reach designated Covid hospitals at the earliest," Mr Moudgil said.

As of date, Karnataka has reported 69 COVID-19 deaths As many as 6,041 people have tested positive for COVID-19, including 2,862 discharges and 3,108 active cases.

Bengaluru, Apr 9: 10 new positive cases have been confirmed in Karnataka, apart from the recent fatality of an 80-year-old woman from Gadag district, the health department said on Thursday.

The fresh cases have been reported in the state from last evening to Thursday noon.

Till date, 191 COVID-19 positive cases have been confirmed, which includes 6 deaths and 28 discharges, the update said.

Among the 10 positive cases, eight are contacts of patients who have already tested positive- one each from Belagavi, Mandya and Chikkaballapura, two from Mysuru, and three from Bagalkote; while two from Bengaluru city are with a travel history to Delhi.

Three cases from Bagalkote are children- two boys of 4 and 13 years of age, and one girl of 9 years old.

The elderly woman died on April 8 in Gadag, the department said in its mid-day situation update.

Confirming that her reports tested positive on April 7, officials had said, she had a history of Severe Acute Respiratory Infection (SARI).