Karnataka crisis: Governor sets second deadline; asks CM to finish floor test today itself

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Kasaragod, Feb 3: The third novel coronavirus case has been reported in India, with another Keralite student who returned from Wuhan University on Monday testing positive for the infection.

The medical student is in an isolation ward at Kanhangad government hospital in Kasaragod, Health Minister K K Shailaja informed the state assembly.

The condition of the student is "stable", she said.

Out of the 104 samples tested till Sunday, three have tested positive.

This is the third positive case reported from Kerala.

Two earlier positive cases, also of students who came back from Wuhan, the epicentre of the virus, were reported from Thrissur and Alapuzha districts.

The minister made the statement in the assembly under Rule 300 in the wake of three positive cases reported from the state.

A total of 1,999 people, who have a travel history from China and other affected countries, are under observation in Kerala, of whom 75 are in isolation wards of various hospitals.

The remaining 1,924 are under home quarantine as per a medical bulletin issued on Sunday night.

The minister has made it clear that those under observation at home should keep away from public functions and should not participate in any events or go out of their homes during the 28 day incubation period.