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Varanasi, Jan 20: An FIR has been lodged against unidentified persons for a controversial hoarding near the Varanasi railway station. It is worth mentioning here that Prime Minister Narendra Modi himself is the MP of Varanasi Lok Sabha constituency.

The hoarding near the Englishiya Line crossing read, "Hindu dharma mein ghar vapasi karo... CAA, NRC se chhutkara pao (Get rid of CAA, NRC by converting to Hinduism)".

Inspector Ashutosh Ojha said that the FIR under section 295 A and 505 of IPC has been lodged.

"Investigation has been launched in the case and those involved in putting up the hoarding would be identified soon," he added.

According to sources, a lesser known outfit, Hindu Samaj Party, had placed the hoarding on the busy road.

The outfit's state Vice President Roshan Pandey had made a video viral on social media with his message in which he claimed to have put up the hoarding in response to the protest being staged at Shaheen Bagh, New Delhi.

The hoarding, which also has photographs of some Muslim women wearing saffron pagdi, was removed by the police late Saturday evening.

It came up at a time when Chief Minister Yogi Adityanath, Union Minister Smriti Irani and other leaders were in Varanasi to address a rally in support of the Citizenship Amendment Act at the Sampurnanand Sanskrit University.

Pandey, along with his supporters, had also tried to stage a sit-in at Lanka to give a call for marching to Shaheen Bagh in Delhi but was prevented by the police.

They were taken in custody and were later released following initial interrogation, said inspector Lanka, Bharat Bhushan.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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