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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Kalaburagi, Mar 5: Kalaburagi Police has issued a second notice to AIMIM leader Waris Pathan, for his controversial remark, directing him to appear before the Investigation Officer on March 8 and give his statement.

Earlier, Kalaburagi Police Commissioner MM Nagaraj said that the police had served notice to Pathan and asked him to appear on February 29 before Investigation Officer.

On February 20, while addressing an anti-CAA rally at Kalaburagi, Pathan had said, "time has now come for us to unite and achieve freedom. Remember we are 15 crore but can dominate over 100 crores."

However, Pathan later took back his words and had said he had not targeted any community but had spoken against members of some organisations.

"If any of my words have hurt someone, I take them back as I am a true Indian," he had said.

Bengaluru, May 3: Karnataka Government has allowed the movement of migrant workers, pilgrims, tourists, students and other persons who are stranded and also those who want to go to their residence as a "one-time measure" from district to district, after obtaining "one-day, one way" passes issued by concerned authorities.

Consequent to the Ministry of Home Affairs (MHA) new guidelines on lockdown measures, the government of Karnataka issued new guidelines on lockdown measures which will come into effect from May 4 for the period of two weeks.

In an order issued on Saturday, Chief Secretary and Chairman, State Executive Committee, Karnataka State Disaster Management Authority stated, "In the exercise of the powers, conferred under the Disaster Management Act, 2005, the undersigned, in his capacity of Chairman, State Executive Committee, hereby order to permit movement migrant workers, pilgrims, tourists, students and other persons who are stranded and also those people who want to go to their residence as a one-time measure from district to district with one-time one-day one-way passes issued by concerned Deputy Commissioners of the districts/Deputy Commissioner of Police in Commissionerates for strict implementation."

The details of the passes issued shall be shared by the issuing Deputy Commissioners of the districts/ Deputy Commissioner of Police with the receiving Deputy Commissioners of the districts/Deputy Commissioners of Police shall follow the SOPs prescribed by the Ministry of Health and Family Welfare for the movement of such persons, the order read.

It is reiterated that this would be a one-time one-day one-way pass for the individuals to reach their final destination.

Meanwhile, three deaths and 12 new COVID-19 cases were reported in the 24 hours in Karnataka, said the state Health Department on Saturday.

According to the Health Department, the total number of coronavirus positive cases in the State is now 601. 271 patients have either been cured or discharged. The virus has killed 25 people so far in the State.