Help poor, needy by not cutting their salaries: Karnataka CM

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, May 27: Former Karnataka chief minister and JD-S leader HD Kumaraswamy on Wednesday said that the state government should withdraw the decision to name the Yelahanka bridge after Hindutva ideologue Vinayak Damodar Savarkar.

"The state government's decision to name the Yelahanka bridge after Savarkar is a disgrace to those who have struggled for the country's prosperity. This doesn't give a good name to the state government," Kumaraswamy tweeted.

"There are many great people who worked for the development of the country before and after independence. Their names could have been used for this bridge. Do other states name their bridges after our leaders? On behalf of the people of the state, I urge the state government to take a step back from this decision," he added.

The newly built Yelahanka bridge was named after Savarkar last year in a BBMP council meeting. Later it was sent to state government for approval. Tomorrow, the bridge is likely to be inaugurated for public use.

Bengaluru, Apr 15: Police on Wednesday conducted surprise raids at nearly 120 shops in Bengaluru following complaints of black marketing and sale of foodgrains above the MRP rate.

Sandip Patil, Joint Commissioner of Police, Crime, Bengaluru in a tweet said that action has been initiated against these shopkeepers.

Though the government has maintained the supply chain of essential items, few shopkeepers have used the lockdown opportunity to charge higher prices for essential items.