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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Madikeri, Mar 29: In an alarming situation in neighbouring Kerala State and instances of inter-state migration of Coronavirus suspects, the authorities on Sunday sealed both Dakshina Kannada and Kodagu borders, prohibiting entry of people from Kerala into Karnataka.

Dakshina Kannada had sealed its borders after repeated instances of people misusing ambulance services to travel to Mangalore. Villagers along with the police hauled mud on to the roads that were used as alternate routes.

The road that connects the two States, which people from east Kasargod used to enter into Karnataka, were closed at Mulleria by dumping mud on the road.

New Delhi, Jan 24: A nurse from Kerala employed at a hospital in Saudi Arabia has tested positive for the deadly novel coronavirus, Union minister of state for external affairs V Muraleedharan said on Thursday.

The minister confirmed that about 100 Indian nurses working in the Saudi Arabia hospital were tested following the threat of coronavirus and one of them was found infected by the deadly virus.

Taking to Twitter, MoS (MEA) Muraleedharan said, "About 100 Indian nurses mostly from Kerala working at Al-Hayat hospital have been tested and none except one nurse was found infected by Coronavirus. Affected nurse is being treated at Aseer National Hospital and is recovering well."

Earlier in the day, he had said that he was in touch with the Indian consulate in Jeddah to provide all possible support to the nurses quarantined at Al-Hayat hospital.

"Spoke to @CGIJeddah on Indian nurses quarantined at Al-Hayat Hospital, Khamis Mushait, Saudi Arabia due to Corona virus threat. They are in touch with hospital management and Saudi foreign Ministry. Have asked our Consulate to provide all possible support", he had tweeted.

Kerala chief minister Pinarayi Vijayan on Thursday wrote to the external affairs ministry seeking intervention in Corona outbreak among Kerala nurses in Saudi Arabia

"Corona outbreak among nurses in Azir Aba Al Hayat hospital in Saudi Arabia should be considered serious and necessary steps must be taken", he had said through the letter.

The chief minister had also requested MEA to communicate with Saudi Arabia to ensure proper treatment and protection for the patients.