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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Shivamogga, Feb 6: A youth, who allegedly uploaded pornography and inappropriate videos of children on social media, was arrested by the district CEN police after a tip-off from the CyberTipline.

The accused is a resident of Sorab taluk and is said to be below 18 years. He uploaded the objectionable content during April and May last year. He was traced based on the IP address of his computer and the mobile call records shared by the investigating agencies.

He was arrested in January under the provisions of the Information Technology Act 2000 and sent to judicial custody, said police sources.

Mangaluru, May 19: Officials at the Karnataka State Natural Disaster Monitoring Centre (KSNDMC) said that Dakshina Kannada, Udupi and Uttara Kannada along with Kodagu, Chikkamagaluru have been alerted about possible heavy rains.

Dr GS Srinivasa Reddy, Director, KSNDMC, said, “Coastal districts have already been witnessing heavy downpour since Monday morning. This will continue for another two days depending on the cyclonic movement along the east coast.”

Until last evening, Haleyangadi and Surathkal in Dakshina Kannada district had received 83 mm and 82.5 mm of rainfall, respectively. Several other areas in Udupi also witnessed heavy rainfall of about 60 to 70 mm rainfall.

The India Meteorological Department (IMD) attributed the rain, which intensified on Monday, to a cyclonic circulation over parts of the Arabian Sea (Comorin area) off the coast of Kerala.

The weather department said the sudden convergence of wind over the peninsular region was due to Super Cyclone Amphan, which is set to barrel into the east coast. The IMD issued an Yellow Alert for coastal Karnataka and Malnad, warning of moderate to heavy rainfall in the next few days.