Hebbal bypoll: Setback to CM as Sharief’s grandson Abdul Rahman gets ticket

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Chmarajanagara, Feb 23: In order to control and keep a tab on the activities within the forest area and after the bitter experiences with frequent forest fires, like the one in Bandipur Tiger Reserve last year Karnataka Forest Department officials have decided to use drones to prevent the occurrences of such wildfires, and to use drones to nab trouble makers and take timely action to put out or prevent forest fires, especially during the summer season.

The department of forest has been working on using drones and setting up a centre in Mysuru or Chamarajanagar to monitor three crucial tiger reserves — Bandipur, Nagarhole, and BRT.

Bengaluru, Jun 4: The Karnataka government has tweaked quarantine requirements for people arriving from Maharashtra, raising the isolation time from a fortnight to three weeks, an official said on Wednesday.

"Returnees from Maharashtra will be sent to institutional quarantine for seven days, followed by 14 days strict home quarantine, total 21 days," tweeted Health Commissioner Pankaj Kumar Pandey.

The 21-day quarantine regimen is for all asymptomatic people returning from Maharashtra, considering most of the Covid cases in Karnataka are having domestic travel history to that state.

If any of the asymptomatic people develop symptoms during the isolation, they will be subjected to a Covid test.

However, some asymptomatic individuals from Maharashtra have been provided some exceptions from the three-week quarantine and designated as special category passengers.

Special category passengers include people who suffered a death in family, pregnant women, children below 10, elderly people above 60, individuals suffering from serious illness and human distress.

Similarly, the department has also made some provisions for business travellers from Maharashtra.

"To establish that one is a business visitor, (that) person should show confirmed return flight or train ticket which should not be more than seven days later from the date of arrival," ordered Chief Secretary T.M. Vijay Bhaskar.

Similarly, if a business visitor is arriving on road, he should provide the address proof of the person in Karnataka he intends to meet.

Additionally, such a person should also produce a Covid negative test certificate which is not more than two days old.

"One does not have a Covid negative test certificate such a person should go for institutional quarantine for two days within which Covid test should be conducted at his own cost. After the test result is negative, that person is exempted from quarantine," he said.

However, business travellers have been exempted from hand stamping.

Amending the Sunday orders, Bhaskar, has enhanced the quarantine requirements for Maharashtra returnees.

Many conditions for visitors from other states remain mostly unchanged as notified on Sunday.