Section 144 clamped in Mangaluru; social media under scanner

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Kasaragod, May 27: In a tragic incident, two persons, who were brothers, died of asphyxiation while trying to rescue a calf that fell in their well at Bandhiyod near here on Wednesday.

Police sources said the elder brother Narayanan (50) entered into the well first to save the calf that fell in the well early in the morning.

His brother Sankaran (40) also followed suit after he noticed his brother fainting deep down the well. However, he also fainted inside the well.

Tumkur, Apr 11: Despite the nationwide lockdown, BJP MLA from Turuvekere constituency, M Jayaram, was on Friday seen celebrating his birthday with several villagers in Gubbi taluk in Tumkur.

A sizable number of people were seen gathering in Gubbi taluk to celebrate the BJP legislator's birthday.

Meanwhile, scores of people around the country are getting booked for violating the lockdown. In Uttarakhand alone, more than 4500 people have been arrested until Friday for violating the norms of lockdown.

Last month, Prime Minister Narendra Modi had called for a three-week lockdown, urging people to practice social distancing to prevent the spread of coronavirus.

The total number of COVID-19 cases in the country has mounted to 6,761 of which 6039 are active cases, 516 have been cured/discharged/migrated, and 206 deaths have been reported.