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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 15: Karnataka government has said that as of now six cases of COVID-19 have been reported in the state, including one person who died.

"Till date six COVID-19 cases have been reported in the state including one death. The 5 Coronavirus positive cases are in isolation at the designated hospital in Bengaluru," the Karnataka government said on Sunday.

Meanwhile, the Health Department of Karnataka on Sunday said that all the family members and other contacts of the 76-year-old man who died of coronavirus in Kalaburagi are being monitored closely.

The Union Ministry of Health and Family Welfare informed that India's tally in the number of positive cases for coronavirus has reached 107 on Sunday.

Bengaluru, Jul 1: Karnataka government has announced a complete lockdown on Sundays till August 2. "There shall be complete lockdown on Sundays from July 5 and followed by next four Sundays till August 2," stated the government. 

"However, essential activities allowed during night curfew will be permitted during Sunday lockdown too. Marriages already fixed on Sundays will be permitted as per norms," also said.

The government further ordered, "All government offices, Boards and Corporations, except those operating and maintaining essential services, shall remain closed on all Saturdays till the second week of August."

Employers should ensure that the Aarogya Setu app is downloaded and used by the employees. The app enables the identification of potential risk of infection,

Regarding Sunday Lockdown, it said, there shall be complete lockdown on Sundays with effect from 5th July, 2020, and followed by next 4 Sundays till 2nd August, 2020.

However, the essential activities as above permitted during Night Curfew shall be permitted during the Sunday lockdown also.

Lockdown in Containment Zones in Karnataka

Lockdown will continue to remain in force in the Containment zones. In the Containment Zones, only essential activities shall be allowed. There shall be strict perimeter control to ensure that there is no movement of people in or out of these zones, except for medical emergencies and for facilitating supply of essential goods and services. In the Containment Zones, there shall be intensive contact tracing, house-to-house surveillance, and other clinical interventions, as required.

All vulnerable persons, individuals above 65, persons with comorbidities, pregnant women and children below the age of 10 years are advised to stay at home, except for health and essential purposes.

Karnataka saw 947 new coronavirus cases, including 503 cases from Bengaluru Urban, taking the total number of cases to 15,242. Death toll has jumped to 246 after 20 deaths were reported on Tuesday, according to the data released by Union Health Ministry.