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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 10: The Karnataka Education Board on Friday further postponed the annual examination for SSLC to May due to extension of lockdown to arrest spread of coronavirus which is spreading like wildfire in the state.

Minister for Primary and Higher Education S Suresh Kumar also announced that the PUC examination were also postponed to May.

"However, depending upon the situation we will announce the date in May and will inform the students one week earlier of the examination date to give time for preparation,"

Udupi, May 23: Issuing a stern warning to people against venturing out unncessarily 7:00 pm on May 23 and 7:00 am on May 25, Udupi deputy commissioner G Jagadeesh said that those who violate the lockdown norms will face punishment. 

“Lockdown should be observed strictly across Udupi district. If anyone is found roaming around, we will not speak, but our batons will”, he said in a press meet here today. 

He suggested the people to buy all necessary things for 36 hours of total lockdown before 7 p.m. today. 

Chief Minister has already clarified that a complete lockdown would be observed in the State on every Sunday. Only the medical shops, newspaper delivery, milk parlours will be permitted to function. Vehicular movement has also been restricted during this period, he said.

If marriages have been scheduled already on Sunday, they will be considered as a special case. However, prior permission is must for scheduled weddings, he said.

Udupi SP N Vishnuvardhan and ZP CEO Preethi Geholot CEO ZP were also present.