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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

New Delhi, Mar 29: "What corona? My children are hungry, they have walked from Gurugram with me do you think corona is what I fear?," Yogesh Gangwar who is salesman in a cloth showroom said as he wiped his tears.

Many others regret for not leaving the city early on.

"God knows when we will reach our hometown. My family was telling me to leave work early in March and get back, but I avoided suggestions and now I am stranded here," Babu Ram who hails from Rampur and works at a plastic recycling factory here in Mundka told media.

Migrant labourers were forced to walk as the public transport were closed and borders were sealed due to the lockdown.

"There is no food to eat, I cannot pay rent of room without my daily wages so I decided to walk with my family from Narela to here. I just hope I get a bus soon," Revati, who works as construction labour said as she fed her three-year-old with pieces of bread that one of the policemen at Anand Vihar gave her.

However, when Yogi Adityanath-led BJP government in Uttar Pradesh decided to deploy around 1,000 buses to help these workers reach their respective hometowns, thousands of them reached Anand Vihar ISBT with a hope to catch one of these buses.

The Delhi government also announced that 100 buses have been deployed to help those trying to reach to their homes in other states on foot.

In order to avoid the spread of the virus, the police asked the people to stand in three queues and also asked the people to de-board the overcrowded buses.

Earlier, budget passenger carrier SpiceJet had offered its aircraft to operate few flights from Delhi and Mumbai to Patna to take migrant labourers, particularly from Bihar, who have got stuck in various parts of the country due to COVID-19 related lockdown.

Mangaluru/Udupi, May 20: The twin districts of coastal Karnataka today reported seven new coronavirus cases. Six cases were reported from Udupi district and one from Dakshina Kannada.

All the six new coronavirus patients in Udupi have been admitted to Dr TMA Pai Covid hospital.

With the new case, 22 confirmed cases of coronavirus have been reported so far in the district, including a one death. Three have recovered, and 18 are active.

55th case in Mangaluru

The new coronavirus patient in Dakshina Kannada is a 40-year-old woman from Neermarga near Mangaluru.

With this, the total number of cases in Dakshina Kannada has risen to 55 out of which 33 are currently active.

The woman had travelled from Rajajinagar in Bengaluru along with her son to Mangaluru on May 10.

Sources said that she was residing in two houses at Kudupu and Kuttikala.

She was suffering from Asthma and respiratory problems. She was admitted to Wenlock COVID hospital on May 17.