Mangaluru: Burkha-clad CFI girls protest in front St Agnes College over hijab ban

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengluru, Apr 20: Lockdown restrictions have been extended by a day by the Karnataka government, in an order issued by chief secretary TM Vijay Bhaskar on Sunday.

The order directed all heads of departments, district deputy commissioners and superintendent of policies to "continue to implement the measures presently in force" as per Ministry of Home Affairs guidelines dated April 14, "till the midnight of April 21, 2020."

The MHA guidelines had earlier allowed the state government to relax lockdown norms post-April 20.

Mangaluru, May 20: The Third Vande Bharat Mission flight carrying 63 repatriates from Muscat landed at Mangaluru International Airport at 8.35 pm on Wednesday. It was piloted by Mangalurean captain Michael Saldanha.

More than half of the passengers from Muscat alighted in Bengaluru where the flight landed first. Remaining 63 passengers came to Mangaluru. 

After landing, all the passengers were given health kits, food and mobile SIMs, and arrangements were made to change their currency at the airport. 

A health department team screened each passenger, after which emigration formalities were completed. Their throat swab samples will be tested for Covid-19 on Thursday.

Union fertiliser minister D V Sadananda Gowda tweeted on Wednesday that the next Vande Bharat Mission flight is scheduled on Friday from Doha to Mangaluru. The flight will land at Mangaluru at 9.55 pm. 

The third repatriation flight from Dubai to Mangaluru is scheduled on Saturday. It will first land at Bengaluru and later fly to Mangaluru. However, there are no flights from Bahrain, Saudi Arabia and Kuwait to Mangaluru.