'Don't know what will happen after one year'

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, May 20: The local unit of Bharatiya Janata Party has defended the delay in repatriation of coastal Kannadigas from Middle Eastern countries saying that it is impossible to bring all expatriate together at a time when covid-19 cases are continuing to spike in the region. 

Addressing a press conference, Sudarshan M, president of Dakshina Kannada unit of BJP said that the entire district administration was working as a team under the leadership local MP Nalin Kumar Kateel and district minister Kota Shrinivas Poojary and seven BJP MLAs in this critical juncture.

“Without any bias, we also have reached out to the needs of people of Mangaluru assembly constituency represented by former minister and Congress MLA U T Khader,” he said, adding that his party will not forget Indian expatriates in the Gulf too. 

Replying to the charge of not catering to the interests of Kannadigas stranded in the Middle East by way of arranging special flights, Sudarshan said this is part of a well-thought-out move to bring them in batches.

“It is impossible to bring back all Kannadigas stranded in Middle East all of a sudden. Their repatriation will be in phased manner based on facilities available in the district,” he said.

“The district authorities have created healthcare and quarantine facilities for a limited number, be it at Covid-19 hospital or institutional quarantine, and bringing them together will create logistical problems,” he said.

Mangaluru, Mar 9: Deputy Commissioner Dakshina Kannada, Sindhu B Rupesh on Monday refuted reports that a passenger who arrived in Mangaluru from Dubai showed coronavirus symptoms had skipped a hospital visit.

While replying to reporters on the issue, Rupesh said: "Passenger who arrived from Dubai has not shown any coronavirus related symptoms. He just had a fever. He was shifted to district hospital last night, but he is not cooperating with us. He is not ready to stay in a hospital. We are convincing him".

"Till now, no positive case of coronavirus has been found in Mangaluru", she added.

Earlier, the Centre had suspended visas and e-visas granted on or before March 3 to people travelling from Italy, Iran, South Korea, and Japan, effective immediately, after a surge in cases of COVID-19 in these countries.

The coronavirus has affected 43 people in India so far and caused the deaths of over 3,800 people globally.