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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jul 8: A corporator and a staff in Mangaluru City Corporation (MCC) have tested positive for the coronavirus. 

The woman corporator, who was under home quarantine for past few days ago, received her covid test report today. 

A staff of health department who works in MCC also tested positive for the covid-19. 

The woman corporator had recently attended a primary health centre meeting. A person who had attended the meeting was later tested positive. Hence the corporator was placed under home quarantine.

Bengaluru, Mar 19: As a precautionary measure to prevent the spread of coronavirus, the Karnataka State Board of Auqaf has issued an advisory to mosques, dargahs and other religious institutions, requesting them to conclude the Friday congregation in 15 minutes for the next three weeks.

"Respected head of masjids and imams (prayer leader) are requested to conclude the entire Juma congregation (including Juma khutbah, salah and dua) in 15 minutes for the next three weeks and avoid using the public mic for the khutbah and salah," read a statement from the Karnataka State Board of Auqaf.

It has advised to ensure cleanliness and good hygiene inside mosques and keep the carpets, prayer mats, floor mats etc clean.

Further, it stated that those coming for daily prayers should be instructed to perform wudhu (ablution) at their homes and avoid using prayer caps placed in masjids.

"Please remove the public towels and prayer caps from the masjids. Sunnah and nafil prayers should observed at home," the advisory read.

The advisory came as the number of coronavirus patients spiralled across the country. The governments are taking all precautionary measures to contain the spread of the virus that has claimed more than 7,500 lives across the globe since its outbreak in China in December last year.