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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, Jul 9: The National Highway 73 between Mangaluru and Chikmagalur was blocked after a huge tree was uprooted and fell on the road near Somanthadka near Belthangady on Thursday due to heavy rain which has been lashing the region since last three days.

The monsoon rain has shifted from the coastal belt to the hilly region of the Western Ghats leading to closure of major roads after a tree was uprooted.

Karkala BJP MLA Sunil Kumar, who was traveling to Bengaluru had to wait for a long time for the traffic to clear.

Meanwhile Chikkamagaluru Deputy Commissioner Dr Bagadi Gautam imposed ban on movement of vehicles on Charmadi ghat from 7 a.m. to 7 p.m.

Mangaluru/Udupi, June 28: The coastal districts of Dakshina Kannada and Udupi have recorded 97 and 40 fresh coronavirus positive cases in last 24 hours. 

With the highest single day spike, the total covid-19 positive cases in Dakshina Kannada mounted to 665, among which 272 cases are now active.

So far 313 people have recovered and discharged from the hospitals. 13 covid-19 patients have passed away. Two among them have died due to non covid reasons. 

With the 40 fresh cases, Udupi’s total mounted to 1179, among which only 135 cases are active. 1042 people have recovered and discharged from the hospitals. Two people passed away.