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Bengaluru, May 12: Karnataka sees the highest single day spike since the start of the pandemic in the state, higher than Sunday's spike in cases. 63 new cases have been reported in last 24 hours. 

With this, the total number of COVID-19 cases rises to 925, said the state health department's bulletin on Tuesday.

While 42 new positive cases reported from May 11, 5 pm to May 12, noon, another 21 fresh 21 cases reported by 5 pm on May 12.

To date, 921 COVID-19 positive cases have been confirmed. This includes 31 deaths and 426 discharged," the bulletin read further.

Morning Bulletin

New cases in Bengaluru Urban 3,  Yadgir 2, Bagalkote 15, Dakshina Kannada 2, Dharwad 9, Bidar 2, Hassan 5, Ballari, Mandya, Chikkaballapura, Kalaburagi (one each).  

Evening Bulletin

Cases in Gadag (3), Kolar (5), Bengaluru Urban (1) and Davangere (11) cases. 

Cases reported on 12 May: 63

Total cases in state: 925
 

Chikkamagaluru, Jul 22: Nine staff of the Anti Naxal Force (ANF) in Koppa in the district were tested positive for Covid-19 on Wednesday.

Health officials said that these people don’t have any contacts outside as they were in the forest buffer zone. Now efforts were being made to find out how they contacted the Coronavirus.

Meanwhile, the Kalsa police station has been sealed down after four of its personnel tested positive.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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