Muthalik, 24 others acquitted in 2009 Mangaluru pub attack case for want of evidence

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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: Chief minister BS Yediyurappa on Monday introduced the Karnataka Municipalities and Certain Other Law (Amendment) Bill, 2020, in the assembly to give voters the opportunity to reject candidates in civic polls.

The bill, if passed, will enable election officials to offer the NOTA option in the elections to municipal corporations on the lines of assembly and Lok Sabha polls.

An amendment bill which seeks to enable the government to set up a separate university for the districts of Raichur and Yadgir was also tabled. The government said the workload of Gulbarga University necessitated creation of a separate university for the two districts, a move that will also help reduce regional imbalance in Kalyana Karnataka region.

Another amendment bill seeks to allow industrial units, which have failed to start operations on allotted land after seven years, to sell off the parcels to another unit. Bills which empower authorised agencies to regulate turf clubs and horse racing and regulate salary and pension of teachers in higher education institutions were also introduced in the assembly on Monday.

Bengaluru, May 6: Karnataka has reported 20 new cases of coronavirus taking total number of cases in the state to 693.

The state health department said in a bulletin on Wednesday that 20 new cases have been confirmed for COVID-19 in the state. "The total number of cases in the state is 693," it said.

The count includes 354 patients who have been discharged and 29 patients who succumbed to the disease.

Out of the remaining cases, 303 patients are in isolation at designated hospitals while six patients are in ICU. The bulletin has also reported one death due to non-COVID cause.

The number of COVID-19 cases in the country reached 49,391, according to the Ministry of Health and Family Welfare on Wednesday morning.

This includes 33,514 active cases and 1,694 deaths due to infection so far.

A total of 14,182 persons have been cured and discharged so far, according to the Health Ministry. One patient has migrated.