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Bengaluru, Apr 16: A 66-year old man from the city, became the thirteenth COVID-19 related fatality in Karnataka, Health Department officials said on Thursday.

The elderly patient from Bengaluru, who was coronavirus positive died on April 15 at Victoria Hospital in the city, officials said.

"He was referred from a private hospital and was admitted in Victoria Hospital and was on ventilator support since April 10," they added.

A 80-year old woman in Belagavi and a 65-year old man from Chikkaballapura had also died on Wednesday.

Bengaluru, April 5: Karnataka Chief Minister BS Yediyurappa on Sunday urged the people to follow the countrywide lockdown strictly amid the rise of COVID-19 cases on Sunday, and said that he has been receiving complaints of people violating the restrictions.

"Everyone knows the damage caused by the COVID- 19 infection around the world. Prime Minister Narendra Modi has announced a nationwide lockdown till April 14 for the protection of people's lives. Even in our state, Bidar, Mysore, Mangalore, Bengaluru and Kalaburagi districts have witnessed a rise in the coronavirus cases day by day," Yediyurappa said.

"The government has taken a number of precautionary measures to control the spread of coronavirus including the closure of borders for public, restrictions on publicly trafficked areas and religious places. The people of the state have to strictly follow the lockdown mandate," he added.

"I have received a lot of complaints about lockdown not being followed effectively. Please remember that the key to ending the lockdown is in your hands. Only you can break the chain by strictly adhering to the restrictions," the CM tweeted.

Earlier on Saturday, 16 people tested positive for coronavirus in Karnataka, taking the total number of cases to 144 in the state.

The total number of COVID-19 positive cases rose to 3,374 in India on Sunday, as per the data provided the Union Ministry of Health and Family Welfare.

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