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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.

Chikmagalur, April 5: BJP Lok Sabha MP from Udupi Chikmagalur Shobha Karandlaje on Saturday claimed that "efforts to spread coronavirus throughout the country" began at Tablighi Jamaat event in Delhi and termed it as "corona jihad".

"Efforts began at Tablighi Jamaat event in Delhi to spread coronavirus throughout the country.

Most of the attendees of that event are untraceable. There seems to be 'corona Jihadi plan' behind that meeting," she said while speaking to reporters here.

Meanwhile, according to officials, out of the seven new cases from Mysuru, two cases are connected to the Jubilant Generics cluster while the rest five cases have a travel history to Delhi.

Total positive cases of COVID-19 in India stand at 3072.

Bengaluru, Mar 14: Amid coronavirus threat, Karnataka Chief Minister BS Yediyurappa has ordered shutting down for a week of all places/activities where people gather in large number including swimming pools, shopping malls, schools, colleges, cinema halls etc, state Health Minister B Sriramulu said.

This comes after Yediyurappa chaired an emergency meeting with ministers and senior officials on Friday to discuss the situation.

Earlier, schools in the state had announced early summer vacation for their students this academic year as a precautionary measure. Other public places have been shut down in the state amid the Covid-19 scare.

The shut down in Karnataka comes after various other state governments ordered similar steps. Uttar Pradesh, Kerala, Jammu and Kashmir etc. are some of the states where governments have ordered shut down as a precautionary measure to contain the spread of the deadly coronavirus.

The central government has also taken several steps to contain the virus, including suspension of all visas to India till April 15. Till date, India has reported two deaths and 82 confirmed cases of the deadly coronavirus.

The World Health Organisation (WHO) has declared the coronavirus outbreak a pandemic. The virus, which originated in the Chinese city of Wuhan last year has spread to more than 100 countries worldwide, infecting over 1,30,000 people.