Kargil martyr's daughter gets 'rape threats' for opposing ABVP

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 19: A recent government order prohibiting congregations, Ramadan prayers is discriminatory and needs to be withdrawn, JD(S) MLC B M Farookh has demanded.

In a letter to the chief secretary, Farookh pointed out that the order contained certain conditions such as restriction of the use of public address system and delivering Azan in low decibels, which had nothing to do with the prevention of Covid-19 disease.

“These days, Azan includes a call for the community to pray at home and does not offer namaz at mosque. The order also prohibits preparation and distribution of porridge, which has always been taken up in the interest of the poor. The High Court has noted that the relief distribution by NGOs or individuals should not be prevented and the state machinery has to coordinate the same by ensuring social distancing. The ban on distribution of porridge by mosques amounts to discrimination. The order needs to be withdrawn or revisited,” he wrote in his letter.

Further, observing that a religious fair was conducted in Kalaburagi recently, in violation of the government’s social distancing norms, Farookh sought the government to ensure that social distancing norms are enforced with regard to festivals of all communities without discrimination.