Ramya’s ‘bird dropping’ tweet on ‘Statue of Unity’ sparks outrage

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 29: Dakshina Kannada Co-operative Milk Producers’ Union Limited in a statement announced that their milk collection centres across Dakshina Kannada and Udupi districts will be closed on March 29 and 30.

Due to a shortage of storage space with them, the Union has decided to stop collecting milk on these two days, according to the statement issued here on Saturday.

The sale/retail of milk and milk products won’t be affected in these two days.

Mangaluru, May 22: Dakshina Kannada today reported a fresh case of coronavirus infection, taking the coastal district's tally to 62. 

The new patient is a 29-year-old womon, who was under instituional quarantine monitored by the district administration in Belthangady. 

She had returned from Mumbai on May 18. Her throat swabs were sent for covid-19 testing on the following day and today she received positive result.

Out of the 62 covid-19 cases detected in Dakshina Kannada so far, only 50 are residents of the district. Among 12 others 4 are from Kasaragod and 3 from Karkala, 2 each from Uttara Kannada and Mumbai, and 1 from Kalaburgi.