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Bengaluru, May 6: More than a month after international flights have been barred, Karnataka government is preparing to quarantine all 10,823 of the state''s people poised to return home from overseas amid the Covid pandemic, an official said on Tuesday.

"The state has planned to quarantine all 10,823 passengers coming back to Karnataka. The quarantine guidelines framed as below would be applicable," said Health Commissioner Pankaj Kumar Pandey in a statement.

According to the Government of India, 10,823 Karnataka residents have been stranded abroad by April 30, comprising 4,408 tourists, 3,074 students, 2,784 migrants and professionals and 557 ship crew.

Out of the 10,823 people, the state government is expecting 6,100 to return early as the government has decided to allow Indians stuck abroad to return.

"All the passengers arriving at points of entry (airports and seaports) will be compulsorily screened for symptoms of Covid-19," said Pandey.

Point of entry screening will include self-reporting form verification, thermal screening, pulse oximeter reading, briefing with instructions, categorisation, stamping for some and downloading of Aarogya Setu, Quarantine Watch and Apthamitra apps.

Arriving passengers are also required to declare existing comorbidities such hypertension, diabetes, asthma or any lung disease, organ transplantations, cancer, tuberculosis and other ailments.

Passengers will be categorised into three groups: Category A (symptomatic on arrival), Category B (asymptomatic with co-morbidity or aged above 60 years) and Category C (rest of asymptomatic passengers).

Depending on the category into which the people fall, their quarantine place and time will be determined.

Category A arrivals will be subjected to institutional quarantine for a fortnight, Category B one week quarantine at a hotel or hostel, followed by another week at home, and Category C home quarantine for a fortnight.

Karnataka government is making elaborate arrangements and logistical means, deploying healthcare, police and several other departments into action to handle the huge influx of Kannadigas and state residents.

Pandey has issued a 21-page elaborate standard operating procedure (SOP) guidelines on how to face the international returnees.

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.