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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 31: Ten persons who were under home quarantine in Bengaluru and had escaped to their native places, were arrested on Monday.
A case has been registered against them at Gurmitkal Police Station, said BH Anil Kumar, Bruhat Bengaluru Mahanagar Palike (BBMP) Commissioner.

Seven new COVID-19 cases were confirmed in Karnataka between Saturday 5 pm and Sunday 2 pm.

The total number of positive cases in the state stands at 83, out of which five have been cured and three have lost their lives, according to the Karnataka Health Department.

Bengaluru, Jun 6: Karnataka Chief Minister B S Yediyurappa on Saturday said hotels and restaurants would be allowed to re-open, but the precautionary measures laid down by the Centre against coronavirus were mandatory.

The Chief Minister on Friday held a meeting with the tourism and transport department, also stakeholders, regarding revival of tourism in the state.

Hotels associations and transport companies have said they would follow the guidelines issued by the government, an official press release said here.

The Karnataka government had said it would go by the Centre's direction on opening religious places of worship, shopping malls, hotels, restaurants and other hospitality services on June 8.

Buses, hotels and taxi owners association placed some demands at the meeting, the release said, adding that Yediyurappa informed them that he would examine their demands and take appropriate decisions.

The Chief Minister also released a handout regarding the guidelines that need to be followed as the tourism department is opening hotels, guest houses and tourist destinations.

Deputy Chief Minister Laxman Savadi, Tourism Minister C T Ravi and senior officials of the department participated in the meeting.

The government had, on Thursday, said safaris, trekking, jungle lodges and resorts in areas that fall outside the COVID-19 containment zones can re-open provided they adhere to social distancing, hygiene as issued by the governments.