NITK's doctoral student arrested for wife's death

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 25: The COVID-19 count in Karnataka went up by 10 on Wednesday, reaching 51. The 10 new positives included two girls aged seven and nine who contracted the infection from their father.

The 34-year-old man had returned from Amsterdam on March 19 and tested positive as the 17th confirmed case in Karnataka.

Though his family were kept in isolation and under quarantine in their house, the children developed a cold. They were confirmed for COVID-19 infection while their mother is still negative.

The government remained tightlipped over whether or not a 70-year-old woman from Gouribidanuru who was put under house quarantine and died on Wednesday morning, tested positive for COVID-19. Government officials would neither confirm nor deny anything on the results of tests on the woman.

This evening’s bulletin issued by the Karnataka health department continued to indicate the strong correlation of coronavirus infection and foreign travel.

Among the positive cases identified today were

A 63-year-old Bengaluru man and his 59-year-old wife, with a history of travel to Brazil and Argentina.
Two 26-year-old men with a history of travel to Spain and arrived back in Bengaluru via Dubai.
Two others, a 63-year-old woman and her 69-year-old husband, had a history of travel to Athens and London.
A 34-year-old man, a resident of Udupi, who returned from Dubai
A 37-year old woman, a resident of Chitradurga, with a history of travel to Guyana and arrived back in Bengaluru via Delhi
Speaking to the media, medical education minister K Sudhakar said health officials were apprehensive the positives may go up tonight.

Of the corona positive cases detected in Karnataka so far, three have been discharged after quarantine, and 47 patients are in isolation at designated hospitals in a stable condition. There has been one fatality.

As per a recommendation by the high-level health committee, the government has decided to convert the Bowring Hospital into a coronavirus treatment hospital facility along with the Rajiv Gandhi Hospital for Chest Diseases and Victoria Hospital. 

“The number of positive cases are growing at an alarming rate and the government needs more treatment facilities. The government is for burning of COVID-19 death cases. However, due to some religious practices, it has been decided they would be buried in 8 ft deep pits,'' Dr Sudhakar said.