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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, Mar 3: Karnataka Health Minister B Sriramulu has said that a medical team is monitoring the health condition of all those people who had stayed with the coronavirus-hit techie who is admitted to a hospital in Hyderabad.

The first confirmed case of the novel coronavirus (COVID-19) in Telangana was reported from Hyderabad on Monday where a man from Bengaluru, who recently returned from Dubai, tested positive for the virus.

"It has come to our knowledge that the coronavirus-hit person in Hyderabad had gone from Bengaluru. Therefore, all the members in the house where he had stayed here have been identified and are under watch," Mr Sriramulu tweeted on late Monday night.

The minister said he has convened a meeting with the additional chief secretary, commissioner and other senior officials of the health department today.

"Our government has initiated all the measures to prevent the spread of this virus," the minister said.

It is learnt that the 24-year-old techie had not contracted it when he was in Bengaluru but all precautionary measures have been taken.

The software engineer, who works in Bengaluru, had worked with people from Hong Kong in Dubai last month where he is suspected to have contracted the virus, Telangana health minister E Rajender told reporters in Hyderabad.

The man reached Bengaluru on February 19/20 and later went to Hyderabad in a bus.

He took treatment for fever after coming to Hyderabad and was admitted to a private super speciality hospital in the city. As it did not subside, he came to the state-run Gandhi hospital on Sunday evening, Mr Rajender said.

Mangaluru, Apr 15: Santhosh Kumar Padil, ASI attached to Mangaluru East (Kadri) Police Station, has helped two children unite with their parents in Kerala.

The children had come to Mangaluru during the holidays and could not return to their native place following the closure of border and lockdown. The two children, hailing from Manjeshwara in Kasargod district, were in the house of their relatives in Mangaladevi and were eager to join their parents.

The relatives of the children had brought the issue to the notice of the ASI and sought his help in the matter.