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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, June 10: The Department of Primary and Secondary Education of Government of Karnataka today ordered a ban on online classes for children from KG to class 5.

The decision was taken following a report based on the report submitted by director NIMHANS, recommending online classes only above the age of 6 years and also following the complaints from several parents about online classes conducted by private schools even for kindergarten kids.

Briefing the media soon after the meeting with department officials, S Suresh Kumar, primary and secondary education minister said, "We have taken two major decisions today. The online classes for LKG, UKG and primary classes should be stopped immediately."

Even collecting fees in the name of online classes should be stopped, said the minister. "We have already issued a circular about it insisting that schools not collect fees in the name of online classes and also requesting schools not to increase fees for the 2020-21 academic year considering financial constraints of several people due to the COVID-19 pandemic," said the minister.

The department, however, also discussed how to engage children during this period as there was no clarity over the reopening of schools for the 2020-21 academic year. "We have constituted a committee to prepare guidelines on how to engage students and increase their knowledge. The committee is headed by Prof. MK Sridhar," he said.

Before taking this decision, the department had three rounds of discussions with various experts, including Prof. MK Sridhar, Prof. VP Niranjanaradhya, Dr John Vijay Sagar and other departments, including the home and health departments.

Bengaluru, Jun 11: Within hours after claiming that it has decided to prohibit schools from schools from conducting online classes till Class 7, the Karnataka government has taken a U-turn and said that currently than ban is only till Class 5.

“Karnataka Govt has decided to stop all online classes for LKG, UKG & classes up to 5th std. To extend this up to 7th std is only a suggestion from few cabinet ministers as expressed in an informal discussion and NOT a decision,” tweeted Prime and Secondary Minister Suresh Kumar.

Law Minister J C Madhuswamy earlier today had stated that the decision to ban online classes till 7th standard was taken by the government.  "All of us were of the opinion that there were challenges faced by students studying in rural areas. Hence, we urged the government to extend the ban on online classes till 7 standard," he said