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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 current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study