Shiv Sena leader Sushil Kumar Jain relinquishes Hindutva, embraces Islam

Udupi, Mar 11: An elderly woman, who had recently visited Saudi Arabia has been admitted to an isolation ward at KMC in Manipal, here with symptoms of fever, cough and breathlessness.

The 68-year-old woman hails from Sagar taluk in Shivamogga district of Karnataka.

The patient had travelled to Saudi Arabia in the last week of February and was treated for fever cough and breathlessness there.

After recovery, she had travelled back to Bengaluru, where she was screened at the airport. 

Later, she reached Shivamogga where she was treated at Nanjappa Hospital for symptoms of fever, cough. 

As she has symptoms of coronavirus, she is quarantined and is under observation. The samples will have been sent to Bengaluru and the result is awaited.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jun 27: Karnataka witnessed the biggest single-day spike in Covid cases on Saturday as 918 cases were recorded and 11 more deaths were linked to the pandemic. 

In Bengaluru alone, 596 more people tested positive for the infection in the last 24 hours as three more fatalities were also confirmed by the Department of Health and Family Welfare Services.

Following is the district wise tally: