All communities should come together to build Ram Mandir: Nalin Kumar Kateel

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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,  Jul 9: Former Karnataka Chief Minister and Congress leader Siddaramaiah on Wednesday said that he was opposed to a tie-up with Janata Dal-Secular in the last Lok Sabha elections but the party high command did not listen to him.

"I had suggested that we should fight alone (in Lok Sabha elections) because JD-S votes would not have come to us and our votes would not have gone to JD-S," Siddaramaiah told reporters here.

Congress leader said that he was the only one to make the suggestion and he did not get support.

"I was the only one to raise a voice that's why it was not heard by (party) high command and I did not get support. We might have won over seven seats in parliament election if we had fought alone," he said.

After forming government in Karnataka in 2018 with support of JD-S, Congress had fought the 2019 general election in a pre-poll alliance with the party. Congress could only one seat of the 21 it contested and JD-S also won one seat of the seven it contested.

Bengaluru, Mar 24: The state government on Tuesday published names and addresses of 14,000 people who have been placed under home quarantine, on its website.  

A district wise break up of the home quarantine patients was also provided.  

Notably, the number of coronavirus cases has risen to 41 in the state.