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Bengaluru, May 23: Karnataka reported 216 covid-19 positive cases in last 24 hours, marking the highest single day spike in the state ever since the first case was detected on 8 March. 187 of these 216 patients have recently returned from Maharashtra.

A 32-year old male resident of Bengaluru died on Saturday making it the 42nd fatality in the state.

The spike on Saturday takes the total number of covid-19 positive closer to the 2,000 mark and the number of active cases to 1,307 in the state, according to the daily health bulletin of the health department.

Yadgir in northern Karnataka recorded 72 cases on Saturday while Raichur recorded 40 cases. Cases in the sugarcane growing region of Mandya continued to rise as 28 people tested positive on Saturday that takes the total number of active cases to 211 as against Bengaluru that has 124.

Gadag registered 15 cases while Bengaluru recorded 4 cases.

Most of those who tested positive on Saturday had returned from other states, especially Maharashtra, one of the worst affected regions in the country.

The spike in cases comes even as the B.S.Yediyurappa-led state government is deliberating further easing of lockdown restrictions post 31 May. The state government has already resumed public bus and train services as well to facilitate inter-district movement of people that has added to fears of spreading the virus from cities to villages where healthcare infrastructure is poor and inadequate.

Karnataka will also see domestic flight arrivals from Monday.

In a statement on Saturday, Bengaluru International Airport said that it introduced ‘Parking-to-Boarding contactless’ journey.

“We have introduced innovative contactless procedures to minimise exposure at the Airport. These enhancements demonstrate our continued commitment to keep our passengers safe in this environment," said Hari Marar, managing director and chief executive of the airport said in a statement on Saturday.

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.