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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Kasaragod, Mar 21: The lack of self-restraint and social distancing by people here, the ones who come from the Middle East regions, in particular, has been a cause of concern for the district authorities who have time and again been reiterating the need to follow tips from health authorities to counter the spread of Novel Coronavirus.

But as things are feared to go out of control, the district authorities including the Collector Dr. Sajith Babu have come out to the streets and bazaars only to impose social distancing instructions now in place in the district strictly since six more persons have been tested positive for Covid-19 on Friday.

According to health authorities, the new cases were caused by a few people who recently returned from abroad and who did not follow the self-quarantine measures.

Bengaluru, May 25: Helpless dairy farmers in a village in Bangaluru Rural district have dumped around 4,000 litres of milk into drains and on anthills.

The shocking incident took place at Chikka Korati near Hoskote yesterday after the Karnataka Milk Federation (KMF) refused to collect the milk because a pregnant woman in the village had tested positive for Covid-19.

The village was sealed off three days ago and three of the woman’s family was sent to institutional quarantine. The incident is an embarrassment since the government has been urging people not to stigmatise patients or their contacts.

“In Hoskote taluk, we lead in milk production,” Guru Korati, a villager, said. “There are around 130 families in the village, but we have two milk producers’ cooperative societies (MPCSs) – Chikka Korati MPCS and Dinne Korati MPCS. Our village produces more than 4,000 litres per day. The KMF refused to collect milk from both societies after they learnt about the positive case. Frustrated, we poured the milk down the drain.”

Guru wanted the government to address the village’s problems. “We are not only struggling to sell milk, but we also cannot transport vegetables which we cultivate,” he said.

Veerabhadrappa, from Chikka Korati in Bayala Narasapura gram panchayat, said: “Several families have cows enough to yield more than 50 litres of milk. What will they do with such a huge quantity of milk?”

Mehaboob Sab, panchayat development officer (PDO) of Bayala Narasapura GP, said, “We aren’t sure how the woman contracted Covid-19. A family member had visited Tamil Nadu and the woman also frequently visited a hospital in Kolar for checkups. We are still tracing her contacts.”