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Udupi, Feb 11: The three patients, including a child, who were suspected to be suffering from coronavirus were discharged from hospital on Monday after the throat swab sample test proved negative for the infection.

The throat swabs of three persons, who were admitted to a district government hospital in Udupi with symptoms of fever on Friday, were sent to Bangalore Medical College and Research Institute for testing of coronavirus.

The trio had returned from China, 15 days ago.

The 30-year-old man from Kaup taluk had been to China on personal work and had returned to Udupi, 15 days ago. He had symptoms of fever, throat pain and cold and he was suggested to get admitted to hospital.

He was treated in the isolation ward.

A family from Mandarthi had gone on a tour to China and had returned 15 days ago. The father and son, who had complained of fever, were kept under observation at the isolation ward in the district government hospital.

Bengaluru, Mar 28: Karnataka has reported 10 new positive cases of COVID-19 between 5 pm yesterday and 8 am today, taking the tally to 74 in the state.

"Ten new COVID-19 cases have been reported between 5 pm yesterday and 8 am today, taking the total number to 74 in Karnataka, which includes three deaths and five cured/discharged persons," said the State Health Department on Saturday.

The total number of active COVID-19 cases in the country has climbed to 873, including 78 cured, discharged and migrated cases and 19 deaths, Ministry of Health and Family Welfare said on Saturday.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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