India needs Modi to make it stronger, says Yeddyurappa

Bengaluru, Jun 5: With the easing of COVID-19 lockdown norms under unlock 1.0, the Karnataka government on Thursday permitted state transport buses to operate even during the night curfew hours 9 pm to5 am.

Autos, taxis and cabs have also been given permission to operate during these hours for picking commuting passengers from pickup points or bus stands.

Chief Secretary T M Vijay Bhaskar in an order said, state transport corporations (BMTC, KSRTC, NEKRTC and NWKRTC) buses have been allowed to operate during night curfew hours from 9 pm to 5 am.

On the basis of their bus tickets, passengers would be allowed to commute to bus stand or from there to home, in accordance with the COVID-19 control measures, SOPs and other guidelines, it said.

Further, during the curfew hours autos, taxis and cabs have been given permission to pick commuters from pickup points or bus stands, it added.

Earlier, the government had revised the night curfew time from the previous 7 pm-7 am to 9 pm-5 am, and said the movement of individuals shall remain strictly prohibited between 9 pm and 5 am throughout the state, except for essential activities.

The government has also said that jungle lodges and resorts, also private organisations providing similar facilities, along with activities they provide like safari, trekking among others would be permitted from June 8, in compliance with the guidelines and SOP issued and following the social distancing norms.  

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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