Tagore's Day' celebrated at St Aloysius College

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Mar 30: In continuing cases of tipplers in the southern states ending their lives due to non-availability of liquor during the lockdown, two men committed suicide in Karnataka's Dakshina Kannada district.

The two suicides were reported in Kadaba taluk on Saturday, police said.

Tomy Thomas (50), a rubber tapping labourer in an estate at Kutrupadi village of the taluk, was found hanging at his rented house on Saturday. Thomas, a native of Kottayam in Kerala, had joined at the estate here a month ago.

Local people said he was desperately moving around in the last few days asking about places where he can get liquor. He had also not reported to work in these days. The body has been kept at the mortuary of a hospital at Deralakatte.

In another incident, a 70-year old man, belonging to Kodimbala village in the taluk, allegedly hanged himself from the branch of a tree near his house at Nakur.

The deceased has been identified as Thomas, who had left his family here 30 years ago and had been working in Kerala. He had returned here only a few years back.

Sources said Thomas, an alcohol addict, was having health problems related to withdrawal. He has been living on pavements at Kadaba without going home.

Kadaba police has registered cases in connection with the two incidents.

Incidents of tipplers committing suicide have been reported in Kerala and Telangana in the past few days. Two men ended their lives in Kerala today while a 50-year old daily wage worker jumped to death from a building in Hyderabad on Friday.

New Delhi, Jul 3: The aviation regulator DGCA said on Friday it was extending the suspension of scheduled international passenger flights in the country till July 31 but added that some international scheduled services on selected routes may be permitted on a case to case basis.

Scheduled international passenger flights were suspended in India on March 23 due to the coronavirus pandemic.

Modifying its June 26 circular that stated that scheduled international passenger flights will remain suspended till July 15, 2020, the regulator stated on Friday it has decided to extend the deadline to July 31, 2020.

However, international scheduled flights may be allowed on selected routes by the competent authority on a case to case basis,” said the circular by the Directorate General of Civil Aviation (DGCA).

Air India and other private domestic airlines have been operating unscheduled international repatriation flights under the Vande Bharat Mission, which was started on May 6 by the Central government.

India resumed scheduled domestic passenger flights on May 25, after a gap of two months.