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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, Apr 11: Seven more people have tested positive for coronavirus taking the tally to 214 in the state.

"Coronavirus cases rise to 214 in Karnataka, with seven more people testing positive between 5 PM Friday and 12 PM Saturday," said the Karnataka health department.

According to the health department, all these seven people have a history of contact with COVID-19 patients. Five of them are workers of a pharmaceutical company in Mysuru.

"Out of the total cases in the state, six people have died while 37 others were cured or discharged," added the state health department.

Bengaluru, Jun 25: Secondary School Leaving Certificate (SSLC) examinations commenced in Karnataka on Thursday amid relaxation of COVID-19 lockdown restrictions.

Schools in the state ensured that social distancing norms were followed and other precautionary measures taken at the examination centres. All the students underwent thermal screening at the centres and were provided hand sanitisers and masks.

"Today, 464 students are writing the exam. In every classroom, 20 students will be writing their papers. We have also arrangements two separate classrooms for those from containment zones and those who are unwell," said Sister Sagaimir, Principal, St. Joseph's Convent Girls High School.

"We have been working for the last two weeks to put everything in place for the examination Ensuring they maintain social distancing, wear a mask and sanitise," she added.

In other schools, arrangements at the designated centres were inspected before the exams began.

Yesterday, Medical Education Minister Dr K Sudhakar held a video conference with senior officials to review the preparedness for safely conducting the SSLC examinations scheduled on June 25.

"8,48,203 students will appear for the SSLC examination starting tomorrow in 2,879 centres across the state. All the guidelines issues by state government must be followed strictly" Sudhakar said in the meeting.