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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jun 25: State-run Kumara Krupa Guest House in the city will be used as 100-bed COVID-19 treatment center for the designated category patients, Karnataka Health Department Sources said here on Thursday.

According to official sources, one wing of the Guest House with 100-bed rooms of individual occupancy having all the facilities is reserved to work as Covid Care Center (CCC) and it will be used for Ministers, MPs, MLAs/MLCs, Senior officers of above Secretary rank for clinical management.

The total number of positive cases reported till date in the State has increased to 10,118, the sources added.

Bengaluru, Jun 17: Amid rising COVID cases in the past two weeks, the Karnataka government is planning to increase testing capacity to 25,000 samples a day, said a minister.

"Due to increase in cases in the last two weeks, the government is trying to scale up testing to 15,000 to 25,000 samples per day," said Medical Education Minister K. Sudhakar.

He said people living in crowded places, sanitation workers, street vendors, healthcare workers, police and other frontline staff would be extensively tested.

"It has also been decided to mandatorily test all those who have symptoms of Influenza Like Illness (ILI) and Severe Acute Respiratory Infection (SARI)," he said.

Similarly, all people over 50 with ILI symptoms will be tested.

The health department will also randomly test samples in old containment zones to make sure that the infection is not recurring.

Currently, there are 72 Covid testing labs in the southern state, 41 government operated and 31 private labs.

However, for a few days, the number of Covid tests in the state have plummeted.

On Monday, the health department has tested only 5,362 samples across the state.

Likewise, on Tuesday, only 7,936 samples were tested, diverging from earlier weeks when around 10,000 cases were tested on an average.

In all, 4.57 lakh samples have been tested so far, of which 4.39 lakh have tested negative.