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Mangaluru, July 10: Five people including four policemen suffered injuries following a clash at Melkar in Bantwal taluk of Dakshina Kannada district last night.

Abdul Salam, 29, a resident of Goltamajalu near Kalladka, was arrested on charge of attacking policemen. He was also attacked by the cops on the spot. Currently he is undergoing treatment at a hospital.

According to sources, Abdul Salam and another person were quarrelling with lorry drivers on the highway. A couple of policemen including ASI Shailesh, who were on patrol, intervened.

This led to a clash between cops and Abdul Salam, who reportedly snatched the baton from a cop and hit the men in khaki, eye witnesses said.

However, police sources claimed that Abdul Salam was holding an iron road and he thrashed policemen with the rod.

Meanwhile, more policemen reached the spot and thrashed the accused before arresting him.

Police sources said ASI Shailesh, HC Devappa and PCs Niranjan and Malik were injured in the incident. The policemen were treated the government hospital in Bantwal.

Abdul Salam, who suffered critical injuries, was taken to a private hospital in Mangaluru after preliminary treatment.

A case was registered against him in the Bantwal Town Police Station under section 353, 504, 506, 332, 307, 427 IPC, and 2 A Karnataka Prevention of Destruction of Public Property Act.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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