Mangaluru man who was murdered after returning from Saudi Arabia laid to rest; wife is suspect

Bengaluru, Apr 29: As many as 11 more people have tested positive for the coronavirus in the last 24 hours in Karnataka, said the State's Health Department on Wednesday.

According to an official statement, 11 new COVID-19 positive cases were reported from 5 pm on April 28 to 5 pm on April 29.

"With this, the total number of positive coronavirus cases in the state has mounted to 534, of which 20 deaths have been reported and 215 people have recovered," added the statement.

Of 20 coronavirus patients who died, one death was due to the non-COVID cause, the statement further said.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 14: An 80-year-old woman from Kulshekar in Mangaluru, who was undergoing treatment for covid-19, today breathed her last in the hospital.

The victim, identified as P-507, was said to be in critical condition for past few days.

The elderly woman and her 45-year-old son were tested coronavirus positive on April 27 days after she got admitted to First Neuro hospital at Padil in the city.

With this the covid-19 death toll in Dakshina Kannada rose to five. Shockingly, all five victims are women. The district has so far reported 34 positive cases including five deaths. Currently there are only 14 active cases. 15 people have already discharged.