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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, Mar 21: Appealing for support to the Prime Minister's call for observing 'Janata Curfew' on Sunday to contain the outbreak of COVID-19, Karnataka Chief Minister B S Yediyurappa has asked people not to come on roads immediately after the end of curfew time as it can nullify the measure.

Noting that people have extended both moral and societal support to this unique curfew, he said "Now, my appeal to people on behalf of Prime Minister Narendra Modiji is, don't come on roads and out of your dwellings immediately after nine in the night when curfew time ends. Remain settled in your houses and bungalows avoiding all public appearances on roads and other public places."

"Your coming out in open can nullify the 14-hour measure to contain the spread of virus. As a co-operation to authorities and the society, please remain indoors and stay with your near and dear ones," he said in a release.

Calling for "resolve and restraint" to fight the virus, the Prime Minister during his address to the nation on Thursday had asked the entire country to observe 'Janata curfew' on Sunday.

Calling for a 'Janata curfew' on March 22 from 7 am-9 pm, Modi had said no citizen, barring those in essential services, should get out of their house, and asserted that it will be a litmus test to show how much India is ready to take on the challenge of the coronavirus pandemic.

Stating the Karnataka government has so far been dealing successfully in containing the Covid-19 virus, Yediyurappa said this has happened because of people's co- operation.

He also asked people not to forget to involve in a bout of applause as a mark of appreciation to people involved in containing the spread of the virus and treating those affected by it.

Three new COVID-19 cases have been confirmed in Karnataka on Saturday, taking the total number of infections to 18 in the state.