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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 21: Three new COVID-19 cases have been confirmed in Karnataka, taking the total number of infections to 18, the state government said on Saturday.

Earlier in the day, Health Minister B Sriramulu giving details about one positive case said, a 32-year old person from Gauribidanur in Chikkaballapura district, who has returned from Mecca has been confirmed for coronavirus infection.

The person has been admitted in a designated isolated hospital for treatment, he said in a tweet.

Details regarding the other two patients are still awaited.

The mid-day situation update by the government also said a circular has been issued to Health and Family Welfare Department officials and staff at all levels to work even on Sundays and general holidays without fail till March 31 in view of COVID-19.

A total of 48 government hospitals and 35 private hospitals have been identified as first respondent hospitals for the case management of COVID-19 cases, it said.

Mental health counselling is being done for positive COVID-19 cases and suspects in the identified hospitals and quarantined persons at home and hospital.

A total of 4,390 counselling sessions have been held till date, it added.

Sriramulu in a tweet, also said the government as a precautionary measure is planning to install thermal test CC cameras at government offices and certain important places.

Mangaluru, Jul 5: A COVID-19 patient escaped from a hospital in Mangaluru on Sunday, Mangaluru Commissioner of Police Vikas Kumar.

A total of 1,925 cases of COVID-19 and 37 deaths recorded in Karnataka in the last 24 hours, taking the total number of cases to 23,474.

The health department informed that the death toll rose to 372 while active cases stood at 13,251 in the state.

According to the Union Health Ministry, India has recorded 6,73,165 numbers of COVID-19 cases and 19,268 deaths.