Triple talaq: Personal laws can't be rewritten, Muslim board tells SC

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, May 8: 45 more COVID-19 cases have been reported from Karnataka, taking the total number of coronavirus cases in the state to 750, the state Health Department said on Friday.

According to the Health Department, the total cases include 371 discharged cases and 30 deaths.

Bengaluru, Jul 3: Karnataka Health Department on Thursday permitted District Health Departments to appoint doctors with MBBS, on a contractual basis with permission of concerned District Health Officers and Commissioners, a statement said.

The state government has also hiked the salary of contractual doctors from Rs 45000 to Rs 60000 per month.

Earlier in the day, Karnataka Health Minister B Sriramulu urged contract doctors to continue offering their services amid their demand for regularisation of services.

"I request the contract doctors with folded hands to continue offering their services. With regard to their two demands, one of salary hike and the other being permanency, I assure all of them that I stand with them and their requests will definitely be fulfilled," said Mr Sriramulu.

The Chief Minister had also discussed about the two issues yesterday and agreed to facilitate the pay hike, he added.