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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, Jul 26: Rubbishing reports about cancellation of institutional quarantine for international passengers in Mangaluru, local health authorities have clarified that 14 day isolation including first seven day institutional quarantine must for international passengers. 

For past couple of days rumours were doing rounds on social media that the government has done away with quarantine for international passengers. A few Mangaluru-based news portals also had published it as news without quoting any reliable sources. 

Meanwhile, district health officer in his clarification message said that neither Karnataka government nor Dakshina Kannada district administrant has revised the quarantine norms for international passengers. 

“Those who arrive from overseas must remain in isolation for 14 days. Out of this, seven days have to be spent in institutional quarantine (in hotel or lodge). During this period, the throat swab sample of the person will be sent for covid-19 testing. If the report is negative, then they will be sent to home quarantine for another seven days."

He said that concession in terms of number of days has only been given for people with other health conditions, children and the elderly. "For children below 10 years, pregnant women, elderly above the age of 60 years and other with other ailments, the throat swab will be collected on the second day of institutional quarantine. If the report turns negative, they will be sent to home quarantine for 14 days."

Bengaluru, May 24: Karnataka Tourism Minister CT Ravi said that coronavirus lockdown has severely marred the tourism industry in the state and the government will revive it in a phased manner.

"It would be beneficial if hotels are opened keeping in mind few restrictions. At present, the tourism industry has fallen flat making it very difficult to promote tourism in the state," Ravi said.

"Our department has planned to promote tourism in a phased manner. In the first phase, we would focus on native tourism; then in the second phase, we will promote inter-district travel; in the third phase, we will put weight behind inter-state tourism and in the fourth phase, we would be promoting international travel and tourism," he added.

Karnataka's COVID-19 count surges to 1,958 with 216 new cases of the virus reported in the last 24 hours, said the Health Department in a bulletin on Saturday.

Out of the total number of cases, 1,307 patients are active cases and 608 patients have been discharged. The total number of fatalities due to COVID-19 in the state has risen to 42.