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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

New Delhi, Jun 16: The class 10 and 12 students of the CICSE board can choose not to appear for pending board exams and be marked as per their performance in pre-board exams or internal assessment, according to top officials.

The board had also submitted the proposal before the Bombay High Court on Monday in response to a petition filed by a parent seeking directions to the authorities to cancel exams in view of the spike in COVID-19 cases.

According to Gerry Arathoon, Chief Executive and Secretary, Council for the Indian School Certificate Examinations (CISCE), the students will have to communicate their option to their respective schools by June 22.

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The exams which were postponed due to the lockdown to contain the spread of coronavirus, are now scheduled to be conducted from July 1 to 14. However, several parents have been demanding the exams be scrapped.

"The students will be given two options---they either appear for the rescheduled exams or choose to have their results based on their performance in the pre-board exams or internal assessment. The option will be available only for the pending exams, the result of the subjects for which exams were already conducted, will be calculated as per performance in the exam only," Arathoon said.

The board also clarified that the students will not be entitled to make a subject-wise choice between the two options for pending exams.

Unlike the Central Board of Secondary Education (CBSE), which will only be conducting exams in 29 subjects crucial for promotion and admission to higher educational institutions, the CISCE will be conducting all pending exams.

The pending CBSE exams are scheduled from July 1 to 15. The schedule for the board exams has been decided in order to ensure that they are completed before competitive examinations. While the engineering entrance exam JEE-Mains is scheduled to be held from July 18 to 23, the medical entrance exam NEET is scheduled for July 26.

While the CBSE has given the option to not appear for pending board exams for differently-abled students, it has canceled the examinations for its around 250 schools situated abroad and has adopted the criteria of awarding marks on the basis of either practical exams conducted or the internal assessment marks.

Coronavirus India update: State-wise total number of confirmed cases, deaths on June 16

A group of parents has filed a petition in the Supreme Court seeking a direction to the CBSE to declare results on the basis of tests already conducted, and calculate the total on an average basis with internal assessment marks of the remaining subjects.

Universities and schools across the country have been shut since March 16, when the Centre announced a countrywide classroom shut down as part of measures to contain the COVID-19 outbreak. A nationwide lockdown was announced on March 24, which came into effect the next day.

While the government has eased several restrictions, schools and colleges continue to remain closed.

According to Home Ministry guidelines, there will be no exam centres in containment zones.

"Wearing of face masks by teachers, staff and students will be mandatory. There shall be provisions of thermal screening and sanitiser at the centres and social distancing rules will have to be followed at exam centres. Special buses may be arranged by states and UTs for transportation of students to exam centres," the Home Ministry has said.

New Delhi, Mar 19: The Supreme Court on Thursday upheld the validity of Karnataka's 2018 reservation law, which granted reservation in promotion to employees belonging to SC and ST categories.

A bench headed by Justice DY Chandrachud holds that applications filed by a group of general category employees for applying 'post-based quota' and the principle of the creamy layer at entry-level in public employment are not maintainable.

The apex court had, in November last year, reserved its order on the applications filed by general category candidates in the matter.

In May last year, the top court had upheld the law allowing reservations in promotions for SC and ST candidates with consequential seniority.