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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jan 23: Karnataka government on Thursday notified the much-hyped anti-superstition law that aims to prevent and eradicate "inhuman evil practices".

According to Social Welfare principal Secretary G Kumar Naik, the state social welfare department has issued a gazette notification and The Karnataka Prevention and Eradication of Inhuman Evil Practices and Black Magic Act, 2017, that intends to protect the common people against "evil" and "sinister" practices, shall come into force with effect from January 4 2020, the government notification issued earlier this month read.

The act seeks to combat and eradicate such inhuman practices propagated and performed in the name of "black magic" by conmen with the sinister motive of exploiting the common people, thereby destroying the social fabric of the society.

Mysuru, Jun 18: The Karnataka government's proposal announced on Thursday to hold online classes for students amid concerns over COVID-19 has not gone down well with thousands of tribal students residing in villages across the state.

A team from Karnataka State Commission for Protection of Child Rights (KSCPCR) visited a few tribal hamlets in Mysuru and Kodagu recently and found that the students, unlike their urban counterparts, lack accessibility to not just smartphones and computers, but basic necessities like power supply.

''When such is the situation in the tribal hamlets, how can you expect students to catch up on their studies if classes are held online?'' wondered M L Parashurama Member, KSCPCR, who toured villages like Thithimathi, Beematagere, Devamachchi and Gaddadi in Kodagu's Virajpet taluk, besides Bavali, Balyadi, Machchuru, and Anemone in Mysuru's HD Kote taluk along with Chairperson Antony Sebastian.