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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Udupi, May 18: G Jagadeesh, Deputy Commissioner of Udupi today warned that criminal cases would be filed, if people under quarantine roam around, as they put the lives of others in risk, by coming out.

He said: "There are more than 6,000 people under quarantine in hotels, hostels, schools etc in different parts of the district. They include those who returned from other countries and other states.”

“We have allowed them to return to the district. Now I am receiving complaints that many of them are violating quarantine guidelines and venturing out. This is unacceptable.”

“As it is a risk to the whole society, severe action will be taken against the neglect and apathy of the persons under quarantine,” he said.

Bengaluru, May 1: As Mumbai link surfacing in some COVID-19 cases in Mandya district in Karnataka, JDS leader and former chief minister H D Kumaraswamy on Friday blamed the district administration for the situation, accusing it of not quarantining 7,000 labourers who 'returned' from the Maharashtra capital.

"The information we have is that there are about 16,000 labourers from Mandya were working in Mumbai of which 7,000 people reached the district. None of them was quarantined properly," Kumaraswamy told reporters in Bengaluru.

He claimed the district, a stronghold of JDS, was staring at a major spurt in cases due to the careless attitude of the district administration. "Government should initiate action against those who are responsible for the laxity," he said.

However, he did not specify when the 7,000 workers returned to Mandya. When asked about Kumaraswamy's claim, officials said they have to verify it. Of the eight cases reported from Mandya on Friday, three had a travel history to Mumbai, a major COVID-19 hotspot in the country, officials said.

A Health Department official said four of the fresh cases were contacts of a patient who tested positive on April 8 and admitted to a hospital. After weeks of coming in contact with him, the four were confirmed for COVID-19, an official said. The Three people with travel history to Mumbai had, in fact, brought the body of a man who died of a heart attack there on April 24, the official added.