Mangaluru | Woman corporator, health dept staff test positive for covid-19

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jun 24: The Karnataka government on Tuesday announced that fever clinics would be established at all district-level and taluk-level hospitals, wherein fever cases would be screened in a separate area.

"Fever clinics to be established at all district hospitals/district-level hospitals and taluk-level hospitals, wherein all fever cases should be screened 24x7 in a separate area and for Influenza-Like Illness (ILI) and Severe Acute Respiratory Illness (SARI) cases to be subjected for swab testing," read a circular from the Department of Health and Family Welfare dated June 22.

The circular said that private institutions in the corporation areas should also be designated as fever clinics.

"100 per cent of Community Health Centres (CHC), 50 per cent of Primary Health Centres and Urban Primary Health Centres (UPHC) to be converted as exclusive fever clinics to screen ILI/SARI during working hours. The remaining PHC/UPHC to cater to non-COVID-19 cases. All health institutions need to have a separate entry for COVID and non-COVID services," the circular further said.

Karnataka on Tuesday reported 322 fresh COVID-19 positive cases and eight deaths.
According to the state health department, the total number of positive cases has mounted to 9,721 and 150 deaths. So far, 6,004 people have been discharged.