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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Mar 3: Bengaluru mayor Gautam Kumar on Tuesday said that the decision to ban protests in front of Town Hall was made by the council and not only by him.

"The decision to ban the protest in front of the Town Hall was made by the entire council and not only my decision. Also, the things which are approved by the councillor are also read by the ruling party leaders," Bengaluru mayor told media.

"Still it is the discretion of the Commissioner to take a call after the council also. As of now, we have banned any protests in front of Town Hall," he added.

Meanwhile, Congress leaders staged a protest against Bruhat Bengaluru Mahanagara Palike (BBMP) Mayor Gautam Kumar and BJP at Council BBMP building against the decision.

"If people will start protesting, it will badly affect the traffic of the city," said Kumar, while commenting on the protest. If they want to talk about the matter, let us have a healthy discussion. I don't have a problem with and I don't think the ruling party has a problem too," he added.

On Sunday, pro-Kannada activist and former MLA Vatal Nagraj staged a protest in front of Sir KP Puttanna Chetty Town Hall (Bangalore Town Hall) against the decision taken by Bengaluru mayor.

Talking to reporters, Nagraj had said: "He does not know the history of the Town Hall. It is a historic building and protests can be staged there."

"Mayor's decision is against Bengaluru's tradition and culture, that's why we are condemning it and are protesting against this decision. We will not allow Mayor's programs in Bengaluru and he will be shown black flags", he added.

Riyadh, June 24: Thousands of expatriates who managed to return to their home countries from Saudi Arabia during covid-19 lockdown are now in a dilemma as the Kingdom has clarified that it will not allow their re-entry till the end of the corona crisis. 

The Directorate General of Passports (Jawazat) announced on Tuesday that the mechanism to resume extension of the exit and re-entry visas for expatriates who are outside the Kingdom will be announced only after the end of the pandemic crisis.

The Jawazat stated this on its Twitter account while responding to queries from a number of expatriates who are currently outside the Kingdom and whose exit and re-entry visas have expired.

They inquired about the possibility of returning to the Kingdom after the resumption of international flight service. 

The Jawazat reiterated that the return of expatriates who left Saudi Arabia will be only after the end of the pandemic and in accordance with the process to obtain a valid re-entry visa.

The directorate said that in the event of any new decisions or instructions in this regard, they will be announced through the official channels.

It is noteworthy that the Jawazat had previously confirmed that its electronic services are continuing through the Absher and Muqeem online portals of the Ministry of Interior and that the service for messages and requests is still available and continuing through Absher for all the beneficiaries of its services.