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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Mar 9: A person who arrived at the airport in Mangaluru from Dubai and was admitted to the isolation ward of a hospital with symptoms of coronavirus has gone missing, sources said.

The patient, who arrived on Sunday, was shifted to the district Wenlock hospital with a high fever and a few symptoms of coronavirus.

He reportedly argued with the hospital staff late in the night that he had not contracted the virus and left the hospital saying he will take treatment in a private hospital.

The hospital health officer called up the police and a high alert has been sounded in coastal districts to locate the person who has 'escaped' from the hospital.

Dakshina Kannada district health officer Sikandar Pasha had earlier said the patient will be kept under observation for 24 hours and will be discharged after routine tests.

The district health department on Monday lodged a complaint with the Mangaluru police station and investigation is on.

Bengaluru, May 4: A total of 37 new COVID-19 cases have been reported in the last 24 hours in Karnataka taking the total number to 651, State Health Department said on Monday.

"Thirty seven new coronavirus positive cases have been confirmed in Karnataka from 5 pm yesterday to 5 pm today. The total number of cases in the state stands at 651," the department said.

The total number of cases includes 27 deaths and 321 persons who have been discharged. Of the remaining 302 cases, 296 patients are in isolation in designated hospitals and six patients are in ICU.

India has registered 2,553 new COVID-19 cases in the last 24 hours and the total number of cases now stands at 44,532.