3 madrasa students brutally assaulted for not shouting Jai Mata Di'

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, Jun 27: A Karnataka government employee on SSLC exam duty at a school in Pavagada, Tumakuru district, on Friday tested positive for Covid-19, prompting the education department to send all staff members of the exam centre on quarantine.

“No student has been affected. All the staff has been replaced,” said R Umashankar, principal secretary, education department.

How soon we get a coronavirus vaccine depends on not only the pace of work in research labs, but also the preparedness of factories supplying glass vials, stoppers and syringes

Kasaragod, Feb 5: The customs officials has confiscated 15.5 kilograms gold from a car at Bekal near here on Wednesday.

Sources said, acting on a tip-off, the customs sleuths intercepted a car at Bekal, and seized the yellow metal which is being smuggled by the occupants into Kerala.

The police also managed to arrest the two youth identified as Khetan (29) and Akash (23), both natives of Maharashtra. They had hidden the gold in the cushion. 

The accused confessed that the gold was being transported from Thalassery to Maharashtra illegally. The custom officials are investigating to find others involved in the case.