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Bengaluru, Jun 11: Most COVID-19 deaths in Karnataka occur when infected elderly people, those with Severe Acute Respiratory Illness (SARI) or any other symptoms delay reaching designated hospitals, a top official said.

Munish Moudgil, chief of COVID-19 War Room in the state, said most of those infected with the virus are brought to COVID-19 designated hospitals at a very late stage and recovery then becomes extremely tough.

He said about 65 per cent of those killed suffered from SARI and are aged above 60.

The death rate due to SARI is 43 per cent for those in the 40-60 age group, he said, releasing data on coronavirus deaths, to reporters.

In the same age group, the mortality due to Influenza Like Illness (ILI) was 17.4 per cent, whereas it is 11.1 per cent among people aged above 60 .

He said 25 per cent of symptomatic patients aged above 60 die due to the virus, while it was 10.7 per cent in the 40-60 age group.

The fatalities among those aged 60 is high even if they are asymptomatic, Mr Moudgil, who is secretary in the Department of Personnel and Administrative Reforms, said.

He said the average number of days spent at these hospitals by those who recovered is about 15 days, compared to 3.5 days for those who died of the virus.

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"Hence persons who are elderly and who have comorbidities or who have SARI must reach designated Covid hospitals at the earliest," Mr Moudgil said.

As of date, Karnataka has reported 69 COVID-19 deaths As many as 6,041 people have tested positive for COVID-19, including 2,862 discharges and 3,108 active cases.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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