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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 19: Following the coronavirus outbreak, Bengaluru's Kempegowda International Airport has introduced ultraviolet treatment while scanning outbound baggage apart from other measures to enhance passenger and staff safety.

"Two custom-designed UV tunnels have been created to disinfect trolleys after every use. Two custom-designed UV tunnels have been created to disinfect trolleys after every use. These Tunnels are located at a cordoned-off area of the Terminal," according to a statement by the Bangalore International Airport Limited (BIAL).

The airport plans to use an ultra-low volume (ULV) spray treatment for check-in bags: all outbound passenger baggage is sanitised before dispatch to the aircraft

Authorities also plan to minimise use of additional trays for footwear by introducing specially designed trays; the trays that are in use are UV treated and sanitised manually after every use.

Officials are currently in the process of implementing silver nano-coating for frequently used touchpoints for self disinfection like check-in counters, Immigration counters, ATRS trays, etc. Currently, sanitisation of high-traffic areas and frequently touched surfaces continues to be done every thirty minutes manually without disrupting the flow of passengers.

All high-traffic areas are sanitised once every three hours by using ULV machines - eight times in 24 hours.

Washrooms across the Airport premises are sanitised on a regular basis with dedicated manpower, irrespective of the frequency of use. 456 units of tabletop hand sanitiser and 107 units of sensor-based hand sanitisers have been placed across the Terminal.

120 biowaste bins located across the Airport campus enable passengers and staff to dispose of their masks, gloves and other PPE conveniently and safely. This bio-waste is managed by a dedicated team and handed over to a Pollution Control Board-approved vendor and taken away for incineration.

The Airport said that the passenger feedback for the contactless process has been positive. "The objective of the process is to minimise physical contact and enhance passenger throughput," it said.

These sanitisation measures come in light of the highly infectious COVID-19 pandemic which spreads through person-to-person contact. Small droplets from the nose or mouth can spread the virus when they land on objects and surfaces around the person.

The government of India has added 141 more flights to West Asian countries for the second phase of Vande Bharat Mission, its massive repatriation programme for citizens stranded overseas because of Covid-19-related travel restrictions.

The second phase was to end on May 22. However, External Affairs Ministry Spokesperson Anurag Srivastava said the ongoing phase will last till June 13 and that India is looking at making Frankfurt a hub for the mission.

With these new flights, more than half of them to the United Arab Emirates, the total number of flights in the second phase of the programme have gone up to more than 400, people familiar with developments said on condition of anonymity.

The flights were added due to increased demand from citizens stranded in West Asian countries and the availability of adequate quarantine facilities in states for the returning Indians, the people said. As with all the flights operated so far under Vande Bharat Mission, priority will be given in the second phase to Indian nationals with compelling reasons for returning to the country, they added.

The additional flights are from the UAE (81 flights), Oman and Saudi Arabia (15 flights each), Kuwait (14 flights), Qatar (11 flights) and Bahrain (five flights).

A majority of the flights are bound for Kerala (84 flights), while the other destinations are Delhi (10 flights), Tamil Nadu (nine flights), Telangana (six flights) Gujarat and Jammu and Kashmir (five flights each), Bihar, Rajasthan and Uttar Pradesh (four flights each), Punjab (three flights), Odisha and West Bengal (two flights each), Chandigarh, Karnataka and Goa (one flight each).

The other 260-odd flights being operated during the second phase of Vande Bharat Mission are from Armenia, Australia, Bangladesh, Belarus, Belgium, Canada, Egypt, Finland, France, Georgia, Germany, Indonesia, Ireland, Israel, Italy, Japan, Jordan, Kazakhstan, Kenya, Kyrgyzstan, Malaysia, Mauritius, Myanmar, Nepal, the Netherlands, New Zealand, Nigeria, Oman, the Philippines, Russia, Singapore, South Korea, Spain, Sri Lanka, Sweden, Tajikistan, the UK, Ukraine and the US.

The second phase of the repatriation programme began on May 16 and will continue till June 13, with all the flights being operated by state-run Air India and its subsidiary Air India Express. Private airlines are likely to be included in the third phase.

As of Thursday, a total of 23,475 Indians have been repatriated under Vande Bharat Mission. The second phase had included new destinations such as Istanbul, Ho Chi Minh City and Lagos, and had increased flights to the US and Europe.

More than 259,000 Indians in 98 countries across the world have registered to return under Vande Bharat Mission. Most of them are workers (28%), students (25%), professionals (14.5%), and short-term visa holders such as tourists (7.6%). Fishermen, deportees and Indian nationals who benefited from visa amnesties have also registered.