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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, May 26: The Karnataka high court has rejected bail to a software engineer who was arrested after his sarcastic Facebook post urged people to spread coronavirus by sneezing in public over two months ago.

Mujeeb Mohammed was sacked by Infosys from the post of senior software engineer after his arrest on March 29.

Justice KS Mudagal observed the investigating officer's report and the case diary prima facie show though Mujeeb was well educated and employed, he uploaded messages which are likely to cause disharmony and panic, and are hostile to humanity at a time when the world is facing the pandemic.

The judge noted that the records indicate Mujeeb has six bank accounts, stayed in Bahrain and Kuwait for some years, was influenced by religious fanatics and anti-national ideas and that he had shared a Pakistan WhatsApp number to someone over information about Islam. The National Investigation Agency is probing his links.

Mujeeb, who is in judicial custody now, has been booked under sections 153A, 505, 270 and 109 of IPC.

His counsel submitted the maximum punishment under 153 A of IPC (causing enmity) would be three years and for other offences, it's even less. He also stated the petitioner would abide by the conditions to be imposed by the court.

However, the government pleader said probe provided leads on the petitioner's links with unorganised terrorist groups and it has to be investigated further.

Udupi, Jun 1: As many as 73 people have been tested positive for coronavirus in Udupi district today.

The district has registered a total of 260 positive cases so far. Majority of the positive cases in Udupi district have inter-state travel history to Maharashtra.