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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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. 10: Karnataka Congress leader DK Shivakumar on Thursday appealed to party workers to save the lives of people of the state and show solidarity with the people in need amid the coronavirus lockdown.

"Humble appeal to Congress party workers that the time has come to do our best to save the lives of people of Karnataka. Hospitals across Karnataka are running short of blood. This is a call for able-bodied to volunteer & donate blood. Let us show solidarity with people in need," Shivakumar tweeted.

With 16 fresh COVID-19 cases reported in the last 24 hours, the total number of confirmed cases in Karnataka reached 197 on Thursday, according to the state's Health Department.

India's total COVID-19 cases rose to 5,865 on Thursday, with 591 new cases reported in the last 24 hours, according to the Ministry of Health and Family Welfare.

Bengaluru, Mar 6: The Karnataka government has directed school authorities to grant leave to students and staff suffering from cold or fever in the light of renewed coronavirus (COVID -19) fears.

"If any student, teacher of staff is suffering from respiratory infections, they should be granted leave. They should be allowed to come back to school only after confirming from the doctor that they are cured. In case of a student or staff staying at hostels developing any symptoms, they should be kept in a separate room," said the government circular.

Aiming at containing the spread of coronavirus, Sriramulu said, "We have formed 1,680 isolation wards in private hospitals. Chief Minister B.S. Yediyurappa has apprised Prime Minister Narendra Modi and Union Health Minister of the situation."

However, the Health Minister said no positive case has been recorded till now in the state.

"Tests are also being conducting on passengers arriving in Karnataka and all precautionary measures are being taken," said Sriramulu about the 40,000 people thermal screened at the Kempegowda International Airport (KIA) in the city. Major private hospitals in the city have geared up to treat suspected cases.

Five Karnataka districts bordering Kerala -- Dakshina Kannada, Kodagu, Udupi, Chamarajanagar and Mysuru -- continue to be under surveillance after three positive coronavirus cases were reported in Kerala

The deadly virus has killed a total of 2,912 people in mainland China till Saturday, bringing the global death toll to more than 3,000, authorities said on Monday.

The Karnataka Health and Family Welfare Department is observing 461 people under home quarantine even as no positive coronavirus case has been reported from the state, an official said on Thursday.

"We are observing 461 people for Coronavirus symptoms at their residences, however, no positive case has emerged from Karnataka," said state Health Department's Joint Director, Communicable Diseases, Prakash Kumar.

The five people under isolated observation at Rajiv Gandhi Institute of Chest Diseases continue to be so on Thursday as well. As many as 273 samples sent from the state for coronavirus testing reported negative.

In Karnataka, 68,717 passengers have been thermal-screened for the virus until now at Kempegowda International Airport in the city and Mangluru International Airport.

Another 5,103 passengers were also checked for the virus at Karwar and Mangluru seaports.

On Thursday, 16 people completed the mandatory 28-day observation period while a total of 225 people also underwent the same.

Karnataka is screening all international passengers and the state health department met the private sector hospitals to take stock of recent developments.