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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Wayanad, Apr 21: Panic gripped residents of Mananthavady and Mepaddi regions of the district after several cats in the region were found dead.

A group of people approached authorities after which the Animal Husbandry Department tested samples from the carcasses and found that the cat deaths were caused by Feline Parvovirus, which does not transmit to humans.

Speaking to ANI, Dr D Ramachandran, Chief Veterinary Officer, Wayanad said that Feline Parvovirus affects cats and vaccines are available to protect cats and keep the virus at bay.

"There were incidents of cat deaths in Mananthavady and Meppadi region of Wayanad district creating panic among the local residents. The officials of the Animal Husbandry department visited the spots for epidemiological investigations. The samples were collected and sent to the State Institute of Animal Diseases, which confirmed that the deaths were due to Feline Parvovirus. There is no need to worry as this virus does not spread to humans," he said.

A cat owner in Meppadi said that within a span of two-three days, over 13 cats had died in the region.

"We are afraid of these sudden cat deaths amidst coronavirus outbreak. We have informed the Health Department and Animal Husbandry department. Officials came here and collected the samples," she said.

Udupi, June 21: A graduation student, who had attempted suicide two weeks ago under depression following the postponement of examinations due to covid-19, breathed his last at a private hospital yesterday. 

The deceased has been identified as Shakuntala, a final year degree student of First Grade College, Muniyal. She was a resident of Mathibettu near Vagranga in Hebri taluk. 

According to sources, she had studied hard to clear the examinations. The postponement of examinations led her to depression.  

She consumed poison at her house on June 8. She was immediately rushed to Manipal hospital where she breathed her last on June 20. A case has been registered in Hebri Police Station.