Muslim families also have moved out of Kairana, admits BJP leader

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, Jan 29: The police have registered a suo motu case against some of the youths who raised life threat slogans against former Karnataka Minister and Congress MLA UT Khader during the pro-Citizenship Amendment Act rally here on January 27.

A video of the incident that went viral on social media showed the youths belonging to BJP and other saffron outfits raising slogans that they will “cut off his limbs and chop off his head if necessary” during the rally organised by the BJP in support of the Citizenship Amendment Act on Monday.

Though Mr Khader did not file a complaint, the Congress party had urged the police to register a suo motu case.

Chamaranagara, Mar 29: As many as 595 Tamil Nadu-based fishermen, who were working in Mangaluru, crossed the Karnataka border and reached their state via Chamarajanagar on Saturday.

Police said following the lockdown, the fishermen had left Mangaluru in more than 20 vehicles. The fishermen crossed the Karnataka border through Punajur check-post. However, the vehicles returned after dropping them near Hasanur check-post in Tamil Nadu.

As the fishermen had no proper documents, they were stopped by Tamil Nadu Police. However, the police allowed them after screening. The Tamil Nadu government arranged vehicles to ferry them, said a police officer.