Sedition charges against Dr Zafarul Islam Khan for warning bigots sparks row

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

New Delhi, Apr 19: The government on Sunday prohibited the sale of non-essential items through e-commerce platforms during the ongoing lockdown, four days after allowing such companies to sale mobile phones, refrigerators and ready-made garments.

Union Home Secretary Ajay Bhalla issued an order excluding the non-essential items from sale by the e-commerce companies from the consolidated revised guidelines, which listed the exemption given to the services and people from the purview of the lockdown.

The order said the following clause -- "E-commerce companies. Vehicles used by e-commerce operators will be allowed to ply with necessary permissions" -- is excluded from the guidelines.

The previous order had said such items were allowed for sale through e-commerce platforms from April 20.

However, the reason for reversing the order is not known immediately.

Hyderabad, Mar 14: Telangana Public Health Director Dr Srinivas on Friday said that 34 people, who came in contact with the 76-year-old Karnataka man who died of coronavirus, have been identified in the state.

"So far, 34 people who came in contact with him have been traced and are kept under strict home isolation by the Telangana health authorities. As of now, all the contacts are stable and under active surveillance by the health teams of the Telangana government," Srinivas said.

He added that the rapid response team of the state is further searching for the persons who might have come in contact with the person who died of COVID-19.

"Telangana health authorities were alerted by the Karnataka government after the 76-year-old man's samples tested positive for coronavirus after his death. The man has visited two hospitals in Hyderabad before he died in Karnataka," Srinivas further said.

The Karnataka man, who had died a few days ago, was confirmed to have tested positive for COVID-19.

Meanwhile, Telangana Health Minister's office said that the lone coronavirus patient from the state has recovered and is going to be discharged from the hospital soon.

The development comes after 82 confirmed cases of coronavirus and two deaths related to the lethal infection have been reported in the country.