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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, Jun 28: In an attempt to curb fast spreading Coronavirus and to bring discipline among the public to follow the guidelines and also as it was found difficult to control the visitors, the City Corporation Mayor Diwakar has ordered closure of the office for one week with immediate effect from Monday.

Public will be banned from entering the MCC building for a period of one week from Monday, he said.

In a circular the Mayor has requested the public to co-operate and help the administration to contain the spread of the coronavirus.

However, a help desk will be set up outside the MCC building where people can submit their applications and requests.

Bengaluru, Jan 6: JD(S) leader H D Kumaraswamy on Monday said he would not get involved in any 'wicked act' of bringing down the B S Yediyurappa-led government in Karnataka, amid claims that 15 to 20 BJP MLAs were ready to come out.

Clarifying that he would not disturb the government, the former Chief Minister said for him, the development of the state was important. "With great difficulty, you (Yediyurappa) have become Chief Minister for the fourth time, (I am) happy, I have nowhere said that I will disturb your government. Even now some people come and ask why I'm sitting silent when 15-20 people are ready to come out of BJP and why don't I make an attempt (to poach them), Kumaraswamy said. Speaking to reporters in Hassan, he sought to know why he should get entangled in that 'sludge' and he was not in a hurry.

"I will not get involved in a wicked act of removing a responsible government like Yediyurappa did. For me the development of the state is important," he said.

Though Kumaraswamy had raised questions about the longevity of the BJP government ahead of the December 5 bypolls, he had even then given clear indications that he would not attempt to pull down the administration as it would affect the development of the state.

The ruling BJP had swept the by-elections by winning 12 of the total 15 seats, helping the Yediyurappa government retain the majority in the Assembly.

With BJP winning 12 of the 15 assembly constituencies, it's numbers went up from 105 (including an independent) to 117, which is well ahead of the halfway mark of 111 in a 223-member Assembly (two seats-- Maski and R R Nagar-- are vacant due to pending litigation in the High Court).

The BJP came to power after the Kumaraswamy-led Congress-JD(S) coalition government collapsed as 17 MLAs had rebelled against the alliance leadership and resigned as legislators, to later favour the saffron party.