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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

In the wake of Saudi Arabia's assurance that Masjid al-Haram of Makkah and Masjid an-Nabawi of Madinah will be opened for believers after some days, a message has gone viral on social media claiming that both the holy mosques will open on Ramadan 8 (May 1).

The message which was widely circulated on Facebook and WhatsApp, also contained certain condition such as people should fetch their own prayer mats and that they should not use the washrooms in the mosques. 

Clarification

Meanwhile, the authorities of the two holy mosques, issued a clarification that the claims made in the viral post are false and baseless.

"The message being circulated about the opening date for Haramiain (two holy mosques) for public is completely baseless and false. The suspension of prayers for general public is still in effect," they said in a social media post.

Indore, Jul 24: A woman who sells fruits on a cart and who lashed out at municipal officials here has done PhD in Materials Science. Her siblings too are well educated and sell fruits as they did not find jobs.

Dr Raisa Ansari, who lives at Bakery Street in Pardeshipura with her family said she wanted to be a scientist but did not get a job anywhere.

Speaking to media persons, Raisa said, "I have done PhD in Materials Science and wanted to be a scientist but did not get job anywhere. I sell fruit here but the municipal officials are bothering us. We are being forced to move from here to there like cattle. Our religion may be the reason why we are not getting jobs but we are proud to be Indian. I am still looking for a job."

Dr Raisa's mother Ayesha Ansari said she herself is not educated, but has four children of whom three girls and one boy studied a lot but no one got job.

Speaking to media persons Ayesha said, "I have four children and they are well educated. I have not studied but all my children are educated but did not get job so all of them sell fruits."

"When the matter came to marriage, one of the daughters got married. Raisa and Shahjahan Bi wanted an educated boy, but they were not able to find a suitable match because of their complexion and sometimes they rejected the proposal because of dowry, so both are single. Two of my grandchildren are studying biology. They will become doctors," said Ayesha.

Meanwhile, people in the neighbourhood lauded the family's abilities. They said theirs was an educated family had to sell fruits as they did not get jobs.