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Mangaluru, Apr 22: City Police Commissioner Dr P S Harsha, on Wednesday, interacted with families of Covid-19 warriors of the Police Department through a special video conference to infuse confidence in them.

He spoke to the family members of the police personnel who, along with ASHA workers, are monitoring the home quarantined people and even assist them in supplying essentials and medicines.

Most of the family member of the police personnel were of North Karnataka origin and the Commissioner asked them to stay safe by staying at home and explained to them the good work done by their family members in the Police Department.

Mysuru, Mar 27: A 35-year old man from Mysuru, Karnataka was tested positive for coronavirus infection on Thursday, taking the state-wide count to 52 altogether.

This new case could be an indication that Covid-19 has entered into the third stage of community transmission in Karnataka, as the infected person neither has any travel history nor have been in contact with Covid-affected persons.

The patient works in the quality assurance section of a pharmaceutical company in Nanjangud in Mysuru district, and has been in continuous contact with medical care professionals.

Mysuru DC Mr Abhiram G Shankar informs that detailed investigation is under process.

He is currently undergoing treatment at an isolation ward in a designated hospital in Mysuru. So far his seven primary contacts have been traced and they are under home quarantine, Mr Abhiram Shankar said.

A 35 year old Mysurean, and another 46 year old Keralite, both who had come from Dubai, were the first and second cases tested positive for Covid-19 in Mysuru. They are also currently kept under isolation.

Mysuru district administration has identified 898 international passengers in Mysuru district including 152 in the taluks. Among them, while 149 persons have completed home quarantine period by now, the rest are still in isolation.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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