CM briefs Sonia Gandhi on Gauri murder probe

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jan 1: Former Karnataka Chief Minister and Leader of the Opposition Siddaramaiah on Wednesday slammed the Centre on the issue of fare hike announcement by Indian Railways.

"Increase in Train fares is a New Year gift by Narendra Modi government to common people," Siddaramaiah tweeted.

"This will further dent the developmental prospects as Railways form a backbone of Transportation. Instead, the govt should have gifted us the values of our Constitution by upholding it," he added.

Mangaluru, May 21: The third repatriation flight from Dubai to Mangaluru will operate on Saturday, May 23, confirmed union minister D V Sadananda Gowda. This will operate via Bengaluru.

The first and second direct repatriation flights from Dubai had landed at Mangaluru International Airport on May 12 and May 18. There were more than 175 passengers on board each of these flights.

On May 23, Air India flight (IX 0384) will take off at Dubai at 4:30 p.m. and land at Bengaluru at 9:50 p.m. It will again take off at 10:50 p.m. and land at Mangaluru at 11:45 p.m.

However, ministry of civil aviation sources said that no final decision has been taken about carrying passengers by these flights to Mangaluru.