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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 7: Leader of Opposition in Karnataka Siddaramaiah on Monday urged Chief Minister B S Yediyurappa to announce a special package to help farmers, agriculture labourers and also working class in various sectors who are affected by the lockdown.

Mr Siddaramaiah put forth his demands during a telephonic conversation and the Chief Minister positively responding to it informed that he will formulate a programme keeping in mind the suggestions made by the Opposition, a statement from the LoP's office said.

It said, the Chief Minister also spoke to Mr Siddaramaiah regarding the government's decision to stop supply of free food for poor and needy through Indira Canteens.

Mr Siddaramaiah on Saturday had written to Yediyurappa urging him to utilise Indira Canteens efficiently and provide food for poor and needy until the coronavirus crisis and lockdown is over.

The former Chief Minister's letter had come a day after the state government had decided not to provide free food at Indira Canteens as concerns were raised about the quality and misuse that was happening.

It had, however, decided to continue to provide subsidised food- breakfast at Rs 5 and lunch and dinner at Rs 10, as usual.

Mr Yediyurappa during the phone conversation on Monday appraised Siddaramaiah that the decision to supply food by fixing a price was taken to stop misuse that was happening.

Mr Siddaramaiah, however, insisted the government should provide food free of cost to the poor and needy, by taking care that misuse doesn't happen.

The senior Congress leader asked the Chief Minister to take action against errant officials who allowed misuse to happen, the statement said, adding that Yediyurappa has promised to look into it.

Initially, the government last month had decided that the state subsidised Indira Canteens would provide food packets free of cost to the poor and needy in the wake of the lockdown.

Bengaluru, Mar 15: The week-long ban imposed by the Karnataka Government from Saturday is yet to get a total response in the State to fight against the spread of killer disease Coronavirus (COVID-19).

The ban has witnessed a considerable reduction in the travelling public by Bus and train. Bus terminal and Railway stations wore desert look or only a very few public travelling. KSRTC, which was maintaining service for every 10 minutes once between the State Capital and to City of Palaces, was forced to cancel most of the service due to very little patronage. 

"We were left with no option but to cancel the fleet since there are no passengers," sources at the KSRTC Bus terminal told media persons.