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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 14: Bus-stands and railway stations in this IT city wore a deserted look on Saturday and malls, cinemas, pubs and night clubs remained shut as part of the lockdown announced by the state government following the country's first coronavirus fatality reported from Karnataka on March 12.

Six people in Karnataka have contracted the virus including the 76-year-old man who died due to this disease from Kalaburagi in the state.

A day after chief minister B S Yediyurappa announced the shutdown for a week, the usual rush at the Central bus-stand was missing.

"Since yesterday there is slackness. Today again we are witnessing the same," a Bangalore Metropolitan Transport Corporation official told PTI.

The Karnataka State Road Transport Corporation, which runs inter-city and inter-state buses, too has seen a decline in its revenue.

"For the past five to six days we are seeing a drop of Rs 32 lakh to Rs 35 lakh in our daily revenue of Rs eight crore," Bengaluru divisional controller B T Prabhakar Reddy said.

On March 13, Yediyurappa issued instructions to stop all kinds of exhibitions, summer camps, conferences, fairs, marriage, sports and engagement events and birthday parties state-wide for a week from Saturday.

Business at pubs and aars have taken a hit due to the virus threat.

"Our businesses have suffered somewhere between 40 per cent and 70 per cent.

It is very difficult to cope with the situation," said Manu Chandra, Bengaluru chapter head of National Restaurant Association of India.

In Chitradurga district, the annual Rathayatra was cancelled whereas in Bengaluru, a temple displayed a board that it will not distribute any 'teertha' (holy water) or 'prasad' (offering) to devotees in view of the coronavirus scare.

Mangaluru, Jul 8: A corporator and a staff in Mangaluru City Corporation (MCC) have tested positive for the coronavirus. 

The woman corporator, who was under home quarantine for past few days ago, received her covid test report today. 

A staff of health department who works in MCC also tested positive for the covid-19. 

The woman corporator had recently attended a primary health centre meeting. A person who had attended the meeting was later tested positive. Hence the corporator was placed under home quarantine.