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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, Jan 15: Thousands of people on Wednesday boarded boats from Ullal's Kotepura to join a massive protest against the amended Citizenship Act and National Register of Citizens (NRC) in Adyar here.

People travelling through boats and steamers decorated with national flags, raised slogans during their journey through the Netravathi River.

The innovative mode of transportation was used by the protestors to reach the venue, as it not only saved time but was also more convenient for the fishermen, as large number of people from this community joined the protest.

The protestors docked their boats at the shore, which was barely 500 metres from the site of protest, being held at Shah Ground in Adyar.

The distance between Kotepura to the Shah Ground is approximately 15 kilometres but protesters would have to walk more five kilometres to reach the venue because of heavy traffic.

Due to protest, the national highway was also blocked and resulted in huge traffic snarls on routes leading to agitation site. 

Bengaluru, May 16: The Karnataka government is expected to take a call on Monday on holding the Secondary Level School Certificate (SSLC) or class 10 examination, which were postponed due to COVID-19 lockdown.

Minister for Primary and Secondary Education S Suresh Kumar said there was a possibility that the state government may come out with a timetable on Monday. "We are holding a meeting regarding the SSLC examination," he told reporters here.

He also said there would be discussions on how to conduct the exams and precautionary measures to be taken in view of COVID-19.

"We have to make arrangements for masks, sanitisers and thermal scanners. We will set up a thermal scanner for a health check-up. We have to make separate seating arrangements for those having health issues. All these issues will be discussed on Monday," Kumar said.

The SSLC exams were supposed to commence from May 27 but due to the lockdown, it was postponed for an indefinite period.