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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, May 6: Karnataka has reported 20 new cases of coronavirus taking total number of cases in the state to 693.

The state health department said in a bulletin on Wednesday that 20 new cases have been confirmed for COVID-19 in the state. "The total number of cases in the state is 693," it said.

The count includes 354 patients who have been discharged and 29 patients who succumbed to the disease.

Out of the remaining cases, 303 patients are in isolation at designated hospitals while six patients are in ICU. The bulletin has also reported one death due to non-COVID cause.

The number of COVID-19 cases in the country reached 49,391, according to the Ministry of Health and Family Welfare on Wednesday morning.

This includes 33,514 active cases and 1,694 deaths due to infection so far.

A total of 14,182 persons have been cured and discharged so far, according to the Health Ministry. One patient has migrated.

Bidar, Apr 2: Karnataka Health Minister B Sriramulu on Thursday confirmed that 11 people out of 27 in Bidar, who had participated in Tablighi Jamaat at Delhi's Nizamuddin Markat have been tested positive for COVID-19.

Speaking to news agency, Karnataka Health Minister said, "We are monitoring 362 people who had attended Nizamuddin Markaz in Delhi. Out of 27 people from Bidar who had attended, 11 have tested positive for COVID-19, while results of 16 others are awaited. Total positive cases in the state are 121."
Meanwhile, Tablighi Jamaat's Maulana Saad has stated that he will fully support the government in its fight against the coronavirus.

This comes soon after an FIR was registered against him in connection with the religious gathering organised in Markaz Nizamuddin area of the national capital.

A huge religious gathering was held at the Markaz building in Nizamuddin between March 13-15, the event came into the spotlight after multiple coronavirus cases were confirmed amongst those who attended the event held in mid-March.

An FIR has been registered against Tablighi Jamaat head Maulana Saad and others under the Epidemic Disease Act 1897 in Delhi.
A total of 2,361 people were brought out from the Markaz in a joint operation by authorities which lasted for over 36 hours, following which the South Delhi Municipal Corporation had carried out a sanitisation of the premises and nearby area.