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Bengaluru, May 20: An Air India flight from Dammam in Saudi Arabia landed here with 161 passengers, including 85 for Karnataka and 76 to Hyderabad, an official said on Wednesday. Among Karnataka passengers there were both Bengalureans and Mangalureans.

"AIC-1910 (Airbus A321-211) landed at the city airport at 8.45 p.m. and 85 passengers, including 9 women and one infant alighted here, while 76 will fly to Hyderabad," the airline official said. 

The flight was 45 minutes behind schedule to Bengaluru.

The airline staff and the state government officials received the returnees in the arrival terminal and gave them masks to wear and sanitizer to wash hands.

All the passengers would be screened with thermal device to read their body temperature though only asymptomatic were flown back.

After completing formalities, including immigration check and filling the self-declaration form, the returnees were taken in state-run buses in batches for 14-day institutional quarantine in hotels and resorts across the city.

Passengers have to download the mandatory Quarantine app on their mobile phone before leaving the airport for contact tracing later.

Another evacuation flight from Kuala Lampur in Malaysia to Bengaluru has been cancelled due to Amphan cyclone over the Bay of Bengal that hit the Odisha and West Bengal on the east coast.

The service was the fourth to the southern state in the second phase of Vande Bharat Mission, the national carrier and its Express arm are operating to repatriate thousands of Indians, including distressed workers, migrants, students, senior citizens and tourists, stranded overseas since the government suspended international flights on March 23 and enforced an extended lockdown on March 25 to combat Covid-19 spread.

The first flight in the second phase landed on Monday night at Mangaluru on the state's west coast, with 177 passengers from Dubai in the UAE.

The second flight to the southern state from Kuala Lumpur in Malaysia landed here (Bengaluru) on Tuesday evening, with 94 passengers.

The third flight from Muscat in Oman landed here at 6.31 p.m. on Wednesday evening and at Mangaluru on the state's west coast at 8.01 p.m.

The remaining flights to Karnataka will land in Bengaluru and Mangaluru over the next 13 days till June 3 from 12 more destinations the world over.

In the first phase of the mission from May 7-17, the airline and its arm flew 6 flights to the state from May 11-15, bringing in 800 passengers, including 623 to Bengaluru and 177 to Mangaluru from London, Singapore, San Francisco and Dubai.

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