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Bengaluru, May 23: The Karnataka government on Friday said returnees from six states with high COVID-19 cases will be kept in institutional quarantine for seven days.

The states are - Maharashtra, Gujarat, Delhi, Tamil Nadu, Rajasthan and Madhya Pradesh.

As per the standard operating procedure released by the government, all people to arrive via rain, air road are expected to quarantine.

After they test negative for the disease in pool testing, they will be sent for home quarantine for another seven days, the government said.

Returnees from other low prevalence states will be asked to follow 14 days of home quarantine, according to the standard operating procedure (SOP) for entry of persons from other states to Karnataka issued by the state health department late on Friday night.

However home quarantine is allowed for pregnant ladies, people above 80 years, patients with comorbidities and children below 10 years of age, along with one attendant after they test negative.

In special cases like businessmen coming for urgent work, the quarantine period will be waived if they furnish a report from an ICMR-approved laboratory showing they tested negative for COVID-19, it said.

However, if they don't have reports, they will have to stay in institutional quarantine and can leave once their results test negative.

In case their stay exceeds 5 days, they will be sent to the fever clinic and get a five-day extension if found asymptomatic.

The report should not be more than two days old from the date of travel.

All Karnataka returnees who entered from 4 May will be tested from 5-7 days from the time of their arrival.

If found COVID-19 negative, they will be sent to home quarantine and will have to follow due precautions, the SOP stated.

Bengaluru, Apr 14: The Congress in Karnataka on Tuesday welcomed the extention of the COVID-19 lockdown till May 3, though it flayed Prime Minister Narendra Modi for not announcing any programme to support the slowed down economy.

Reacting to the lockdown extension, Congress president D K Shivakumar said it was much needed to control the virus but expressed his displeasure for not offering any relief measure to uplift the economy which is witnessing slump.

"We had expectation that some package would be offered but that was not done. The manufacturing sector, service sector, agriculture sector and even the medical sector was looking for some relief but that was not the talking point of the Prime Minister," Shivakumar told reporters.

However, he maintained that the party would cooperate with the Centre in its fight against COVID-19.

Leader of the Opposition Siddaramaiah said he was "disappointed" that there was no programme announced to improve the economy, which is at the lowest level in 30 years.

"The economy has collapsed. Never ever in 30 years it had witnessed such a downfall. Industries are closing down.

Agriculture in bad shape. poeple have no money. Villages are in distress," the former chief minister said.

He opined that Modi should have make some announcement with regard to economic programmes and assistance to the weaker section.

"Labourers today are on the streets. Their programmes do not touch them. People had lots of expectations which are now meaningless," Siddaramaiah said.

However, he underlined that he does not oppose the lockdown and appealed to the people to support it wholeheartedly.

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.