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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jun 12: Karnataka on Saturday reported 209 discharges, as the state confirmed 308 new cases of COVID-19 and three related fatalities, taking the total number of infections to 6,824 and the death toll to 81.

With the 14 new cases, the total number of covid cases in Udupi district alone today reached 1005. Dakshina Kannada today reported 30 cases and the tally mounted to 263. 

Today highest cases were reported from Kalaburgi (67), followed by Yadgir (52), Bidar (42) and Bengaluru Urban (31). More details to follow.

Bengaluru, Jan 31: Senior IPS officer Praveen Sood is the new Head of Police Force in Karnataka as the current DG and IG Neelamani Raju today retired.

Praveen Sood, the DIG of CID’s Economic Offences Wing, introduced several reforms that sped up investigation processes. He introduced the Crime and Criminal Tracking Network System all over the state by networking all police stations in the country and ensuring data entry and retrieval of all information in police stations and higher police officers online.

Born in 1964, Sood graduated from IIT Delhi and joined the Indian Police Service in 1986. He kicked off his career as the Assistant Superintendent of Police in Mysuru in 1989. He has served as the SP of Ballari and Raichur before being posted as the Deputy Police Commissioner (Law and Order) of Bengaluru.

In 1999, he served as the police officer on foreign deputation as the police advisor to the Government of Mauritius for 3 years.  He was posted as Police Commissioner of Mysuru City between 2004 and 2007.

He took over as the Additional Commissioner of Police (Traffic) in Bengaluru in 2008 and continued in the post till 2011. He has won the Chief Minister’s Gold Medal for excellence in service in 1996, the Police Medal for Meritorious Service in 2002  and the President’s Police Medal in 2011.

During 2013-14 he took over as Managing Director of Karnataka State Police Housing Corporation. He later worked as the Principal Secretary to the Home  Department as the Additional Director General of Police (Karnataka State Reserve Police) and the ADGP of Administration.

In 2017, he was appointed the Bengaluru Police Commissioner. He was also instrumental in launching “Suraksha” App and “Pink Hoyasalas” managed by all-women police officers.

As the DIG of the CID, Economic offences and Special Units, he is credited for opening the Centre for Cyber-crime Investigation, Training and Research for training police officers, prosecutors and the judiciary in handling cyber crime cases.