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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Jul 6: At least 8 lakh Indians may be forced to leave Kuwait as the country's legal and legislative committee has approved a draft expat quota Bill, reported.

The Bill, which states that Indians should not exceed 15 percent of the population, was determined as constitutional by the National Assembly, local media reported.

It will soon be transferred to the respective committee so that a comprehensive plan is created.

Expats account for 30 lakh of Kuwait's 43 lakh population. Indian community constitutes the largest expat community in Kuwait, totalling 14.5 lakh.

The move comes as the number of Covid-19 cases has spiked in the country, with 49,000 cases being reported so far.

Udupi, May 21: In a shocking development, as many as 27 fresh coronavirus positive cases were reported in the coastal district of Udupi today. 

Another shocker is, 16 among 27 covid-19 patients are children. The rest are six men and five women. 

Interestingly, all of them have inter-state travel history. 23 had come from Maharashtra and 3 from Telangana. Another one had come from Kerala to Manipal. More details are awaited.