Karnataka's Davanagere district reports 21 COVID-19 positive cases

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 4: Chief Minister BS Yediyurappa on Friday asked Primary and Secondary Education Minister S Suresh Kumar to be the government's spokesperson on the Novel Coronavirus crisis management effort, a move that is being seen as keeping too many cooks from spoiling the broth.

At a high-level meeting to review measures on COVID-19 containment, Mr Yediyurappa is said to have taken exception to his Cabinet colleagues making multiple, and often contradictory statements, leading to confusion.

''The CM has directed Mr Kumar to be the only one to brief the media on COVID-19,'' a source from the Chief Minister's Office (CMO) confirmed.

Udupi, May 30: Following the announcement of re-opening of places of worship from June 8, Ibrahim Musliyar Bekal, the Qadhi of Udupi has called upon the Centre and State governments to issue uniform guidelines for Muslims to be followed while going to mosques for congregational prayers.

In a media statement, he said that even though the government is relaxing the lockdown in a phased manner things will not be like before as people have to follow the precautionary measures to control the spread of the coronavirus. 

He said that the union and state governments after holding discussions with the authorities of Central Waqf Council and the State Waqf Boards and Islamic scholars, should form a uniform guidelines for all mosques.

He also suggested a few guidelines such as offering congregational prayers soon after adaan, closing the mosque soon after prayers, maintaining physical distance and avoiding the use of toilet in mosques. 

He also suggested the sick, elderly people and children to prefer to offer prayers in homes instead of mosques until situation becomes normal.