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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Thiruvananthapuram, Dec 4: Depressed over the communal and racist policies of union government, a 67-year-old retired school headmaster committed suicide allegedly after losing matriculation certificates and documents related to his father.

The victim was identified as Mohammed Ali a resident of Narikunni in Kozhikode district in north Kerala.

On finding Ali missing from home on Friday morning, his family members conducted a search in the nearby areas. His body was later found in a well located in one of his relative’s compound nearby.

A suicide note recovered, suspected to have been written by the victim read, “I have lost all my important certificates. Matriculation certificates of me and my wife. Old documents of my father are also missing. I think all these documents were given away along with the waste recently. None should be held responsible for my foolish act. You may get into trouble.”

According to relatives, Ali was under severe stress after regularly watching programmes related to CAA. He was also actively involved in anti CAA campaign.

“He was worried about the documents and had serious apprehensions about future,” said his younger brother Abdul Nasser.

“After attending an anti CAA meeting in Kozhikode he had shared his apprehensions. He used to frequently discuss the topic with others ,” recollected Jaffer a local resident.

Ali also had health complications. Meanwhile, the local police said that preliminary investigations suggested that the man could have taken the extreme step after losing documents. However, the reason behind the suicide could be said conclusively after detailed probe.