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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Thiruvananthapuram, Feb 6: The Kerala government on Wednesday said three foreign nationals were among the 2,528 people under observation in the state for the novel coronavirus infection and no new cases have been reported.

At least 93 people with minor symptoms of the virus have been lodged in isolation wards of various hospitals, state Health Minister KK Shailaja told reporters in Thiruvananthapuram.

India's three positive cases for the virus has been from the state's three districts of Thrissur, Alappuzha and Kasaragod.

All the three are students of China's Wuhan university, the epicentre of the virus.

"No new cases of coronavirus has been detected in the state today. At least 2,435 are under observation at home while 93 are in isolation wards at various hospital across the state," Mr Shailaja said.

The minister also said two foreigners have been quarantined in Ernakulam district and one foreign national at Thiruvananthapuram.

"The foreigner in Thiruvananthapuram has been kept at general hospital but not because he was showing symptoms but for observation as he travelled from China," an official said.

The health status of the three patients, who had tested positive for the virus, "remains satisfactory", the minister said.

After three cases were reported, the Left Democratic Front (LDF) government had declared the epidemic as a "state calamity" on Monday.

The health department has issued advisories to the education, tourism and the animal husbandry departments on taking precautions.

"The students, teachers, other staff members residing with families of Wuhan/China returnees who are already in home isolation should not attend classes...," an advisory issued to the education department read.

Rajan Khobragade, Principal Secretary (Health), said the health department has directed the District collectors to hold a meeting with the religious leaders of the district to create awareness during prayer meetings.

"We have directed district collectors to meet religious leaders and talk to them about the seriousness of the situation and create awareness among them and their followers on how to contain the spread of virus," the minister said.

Mr Shailaja also said the department got messages from some Kerala students studying in China, who returned to the state after the virus outbreak, that their Universities had asked them to return and attend classes.

"We have got some messages from the students that they were being recalled by the universities in China. We discussed the matter and it was decided that the centre will contact such universities and convey the message that it was not possible to send the students back to China until the epidemic was under control," the minister said.

Mr Shailaja also said even though there were no positive cases for the second consecutive day on Wednesday, the state needs to remain vigilant and reiterated the 28 days quarantine period for those returning from China.

Of the 2,528 people under observation, the maximum number is from Malappuram (383), followed by Ernakulam (333), Kozhikode (306) and Thrissur (241).

Wayanad/Thiruvananthapuram, Apr 24: Amid the strict lockdown, a school teacher travelled from Thiruvananthapuram to Muthanga in Wayanad -- a distance of about 465 km -- on her way to neighbouring Karnataka en route to Delhi following which cases have been registered against her and an excise official.

The woman, Kamna Sharma, said to be working in Kendriya Vidyalaya, Pattom, undertook the journey on April 21 along with her two year-old daughter, police sources told news agency PTI.

An Excise Circle Inspector, Shahjahan, had provided his vehicle to travel allegedly on the instructions of Malappuram excise officer, in whose private vehicle, the woman and the child had reached Wayanad border from Thiruvananthapuram, the sources said.

The two were charged under the Kerala Epidemic Act and various sections of the IPC including sect 269 (negligent act likely to spread infection) and 271 (disobedience to quarantine rule).

Because of the lockdown even inter-district travel is not allowed by police and district administration, unless there is an extremely genuine reason.

A senior police official in Thiruvananthapuram said he does not remember issuing any such pass.

The woman may have "misused" government machinery as private vehicles would have been stopped somewhere during the long journey, he said.

She came to Kalpetta in Wayanad allegedly in an official car of the excise department.

Wayanad District police chief R Elango said that an FIR has been filed based on preliminary information and investigations have begun.

"We will check if she has followed procedures in obtaining a pass and if she made any false claim to get the pass."

As per preliminary information the woman came in an excise official's car from Thamarassery (Kozhikode) to Muthunga(Wayanad), he said. Her mode of transport before that--from Thiruvananthapuram to Wayanad--will also be investigated, he said, adding they have no information if she has reached Delhi.

"We will track down her movement," he said Meanwhile, theWayanad district administration has intensified the lockdown protocol from Thursday to prevent people's movement within and from outside the district/state.

Interception at all the check posts on district an state borders of the district, bordering Tamil Nadu and Karnataka, will also be intensified. No one would be allowed to travel frequently to and fro the district under the pretext of official duty.

Wayanad collector Adhila Abdulla said officials from outside the district will no longer be allowed to commute daily.

"Elderly people above the age of 65 should confine to their homes unless it is extremely urgent or unavoidable. Cases will be registered against family members who allow elderly people to go out for buying medicines and other essentials," she said.

Senior citizens, who live alone, can call either the Fire (101) or Police (100) departments for any help and to get things they need, the collector said.

Whatever relaxations were in place have also been withdrawn with effect from Thursday, she added.

Wayanad and Thiruvananthapuram come under the "Orange B" zone where there are some relaxations.

However, Thiruvananthapuram city limits falls under the hotspot area.

Police said a case was also registered against a doctor and her husband who entered Kerala from Tamil Nadu border.