Saudi govt intervenes to help stranded Indian expats, vows necessary action

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 27: Indian prime minister Narendra Modi has said the monthlong ongoing lockdown has yielded positive results and that the country has managed to save “thousands of lives”.

Modi, who had a videoconference with various heads of the states on Monday, said the impact of the coronavirus, however, will remain visible in the coming months, according to a press statement released by his office. On the issue of getting back Indians who are overseas, the Prime Minister said that this has to be done keeping in mind the fact that they don’t get inconvenienced and their families are not under any risk.

During the meeting with state heads, Modi advocated for social distancing of at least 6 feet and the use of face masks as a rapid response to tackle COVID-19.

He said that states should put their efforts of converting hotspots, or red zones, into “orange and thereafter green zones”.

India last week eased the lockdown by allowing shops to reopen and manufacturing and farming activities to resume in rural areas to help millions of poor, daily-wage earners. But the economic costs of the nationwide lockdown continue to mount in a country of 1.3 billion people.

Modi, who put India under a strict lockdown on March 25, did not say if the lockdown restrictions will extend after May 3.

India has confirmed over 27,000 cases of the coronavirus, including 872 deaths.