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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 14: Former Karnataka Chief Minister Siddaramaiah on Tuesday demanded that BS Yediyurappa-led government should cut down on 'unnecessary' expenditures to mobilise funds to fight against coronavirus.

"Yediyurappa government needs to cut down on unwanted expenses which government is spending on several things in order to save the taxpayers money to fight against coronavirus," said Siddaramaiah here in a press conference.

He alleged that the ruling state government is indulged in corruption due to which the government is running bankrupt, adding that instead of mobilising funds, Yediyurappa government is only concentrating on auction of Bangalore Development Authority (BDA) sites.
Siddaramaiah claimed that the "BDA was already in loss".

"The present government does not have money due to its involvement in corruption. The Karnataka government must concentrate on cutting expenses and there is no need to waste money on unwanted things including vehicles for board and corporations chiefs," said the Congress Legislature Party (CLP) leader.

"Yediyurappa government has decided to auction more than 12,000 BDA sites to get benefit of Rs 15,000 crore, rather than fullfiling requirements of people of the state at the time of coronavirus crisis," he said.

In Karnataka, 247 people have tested positive for coronavirus, including 59 cured and discharged and 6 deaths, according to the Union Health Ministry.

Bengaluru, Jul 13: In an attempt to avoid the ugly scene of migrant workers walking to their native places due to the current week-long lockdown imposed in the state, the Karnataka State Road Transport Corporation (KSRTC) is running 1,600 additional buses on Monday and Tuesday to help them return safely.

The KSRTC has already run 249 additional buses from the State capital and has so far ferried 6,641 passengers and 231 buses have been booked.

The KSRTC appealed to the public not to panic as additional buses have been deployed. "After ensuring social distance and conducting thermal screening, passengers will be allowed to travel. It has already been planned to operate additional buses," the corporation stated in a press release here.