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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 3: Four central crime branch (CCB) police personnel tested positive for coronavirus on Friday in Dakshina Kannada district in Karnataka.

So far, eighteen police personnel, including an official of the ACP rank and 12 from Ullal police station, have tested positive for Covid-19 in the district in the last few days, police sources said.

A policeman from Mangaluru Rural station and another from Puttur station have also been infected.

All the personnel who tested positive have been admitted to the designated Covid-19 hospitals.

City police commissioner Vikash Kumar Vikash said adequate protection has been provided to police personnel who were fighting the pandemic and the members of their families.

As of Thursday, the total coronavirus cases in the district stood at 923 and the toll 18 while the state's infection count has crossed the 18,000 mark with 272 deaths.

Dubai, May 18: An Indian working in a mining company in the UAE has become the latest expatriate to have lost his job for hate-filled social media posts targeting Islam and Muslims.

Brajkishore Gupta was fired without notice for calling Indian Muslims 'coronavirus spreaders' and hailing the Delhi violence as 'divine justice' in his Facebook posts.

Gupta, who is from Chapra, Bihar, was employed by Stevin Rock, a mining company headquartered in Ras Al Khaimah city.

"This isolated incident involving a junior employee was investigated and dealt with immediately resulting in the termination without notice of this person's employment with Stevin Rock," said the company's business development and exploration manager Jean-Francois Milian.

"Our company policy supports the direction of the UAE government in promoting tolerance and equality and strongly renouncing racism and discrimination and we have sent communications to all of our employees irrespective of their religious or ethnic background reminding them that any such behaviour is unacceptable and will lead to immediate dismissal," Milian was quoted as saying in the report.

Three Indians based in the UAE were either fired or suspended from their jobs for "Islamophobic" posts on social media early this month.

On April 20, India's ambassador to the UAE Pavan Kapoor had warned Indian expatriates against such behaviour.

"India and UAE share the value of non-discrimination on any grounds. Discrimination is against our moral fabric and the Rule of law. Indian nationals in the UAE should always remember this," he said in a tweet.

Last month, Sharjah-based businessman Sohan Roy had to apologise for "unintentionally hurting religious sentiments" through his poem, which alluded to a Muslim religious group.

In March, chef Trilok Singh was fired from a restaurant in Dubai for an online threat against a student in Delhi over her views on the Citizenship Amendment Act.