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Bengaluru, Mar 18: Two more people have tested positive for COVID-19 in Karnataka, taking the tally of infected persons in the state to 13, Health Minister B Sriramulu said on Wednesday.

A 56-year-old man, a resident of Bengaluru had returned to India from the US on March 6 while the second person is a 25-yr-old woman with a travel history to Spain.

"2 more COVID-19 cases have been registered in Bengaluru today, taking the total infected cases to 13. 56-year-old male, resident of Bengaluru returned from the USA on 6th March. Another 25-yr-old female has returned from Spain," Sriramulu said in a post on his Twitter account.

A total of 147 positive cases of coronavirus have been reported in India so far, the Union Ministry of Health and Family Welfare said on Wednesday.

Bengaluru, Mar 14: Following the footsteps of the neighbouring state Kerala, the state government has decided to deliver groceries to the mid-day meal scheme beneficiaries at the anganwadis.

The state govt has also declared one-week holiday for anganwadis, as a precautionary measure to control the spread of COVID-19 among children.

The respective district administrations have been directed to take necessary steps to ensure that the groceries are delivered to the students’ homes as well.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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