Bantwal: 2 arrested for razing Christian structure, installing Hindu deity; cop suspended

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Kochi, Jul 15: Alisha P Shaji, a commerce student from Kerala's Kochi scored 499 out of 500 in the Central Board of Secondary Education (CBSE) class 12 results declared on Monday, wants to pursue a career in economics.

While talking to news agency on Tuesday, she said that she never joined coaching classes.

"I was surprised after knowing the unexpected result. I never expected this, I expected close to 98 per cent. I had five subjects to write but I could attempt only three as two were postponed. I am sad that I could not attempt them, but I am happy that I scored 100 in those subjects. In future, I want to pursue a degree in economics," she said.

"My friends, family and teachers are very supportive and I am thankful to them. I never went to tuitions. I used to study four to five hours a day," she added.

Alisha further said that she wants to give the message that it is okay to start late, but continuity is key to achieve good results.
CBSE on Monday had declared the results for Class 12 examinations 2020.

As per CBSE, with 88.78 per cent pass percentage this year for Class 12, the pass percentage has increased by 5.38 per cent. Last year, the pass percentage was 83.40 per cent.