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Mangaluru, May 12: The first repatriation flight to Mangaluru from Dubai with nearly 180 passengers landed at the international airport here. 

The total passengers, including 88 men, 84 women, five children and two infants arrived by the Air India Express flight IX 384 late Tuesday night, airport sources said.

There were 12 medical emergency cases and 38 pregnant women among them, they said. The district administration had made arrangements for receiving the passengers, who were provided with sanitizers and masks. They were advised to maintain social distancing as per the health protocol.

All the foreign returnees were screened as per the standard operating procedure to ensure that they were asymptomatic.

The passengers were taken to their chosen place of accommodation in KSRTC buses. They will be undergoing a 14-day quarantine in the places, which will be monitored by doctors assigned by the health department. More than 17 hotels and 12 hostels have been arranged for the accommodation of the returnees.

Passengers were also asked to download the mandatory 'Aroygya Sethu' app for contact tracing. Rahul Shinde IAS who is in charge of arranging quarantine facilities, airport director V V Rao and district health officer Ramachandra Bairy were present at the airport.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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