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Bengaluru, May 27: A yet incomplete state-wide survey has revealed that there are over 53.99 lakh households vulnerable to the infection in Karnataka. The survey is being conducted by the government to find COVID-19 vulnerable population particularly with comorbidities and cases like SARI and ILI.

The survey, which is 67.16% complete so far, finds 1.37 lakh households across Karnataka have people with comorbid conditions, excluding a further 13,341 households with symptoms of Influenza Like Illness (ILI), Severe Acute Respiratory Infection (SARI) and Covid-19.

Over 48 lakh households have senior citizens, who on account of their age are at highest risk of death from the disease.

Munish Moudgil, Director of the State COVID War Room, clarified that households could have multiple types of vulnerable people. According to the survey data (which is dated May 26), Kalaburagi and Bengaluru Urban have the highest cases of SARI, ILI with 1,902 households and 1,703 households respectively, although these numbers are likely to rise, as the survey is still incomplete in these districts. 

A BBMP source said that 68% of the survey has been completed in the city, but the data has not been logged yet. The number of SARI/ILI cases is next highest in Shivamogga with 1,217 households, Mysuru with 1,200 and Davangere with 1,178.

The government regards SARI and ILI as indicators of coronavirus and on April 17, had passed an order instructing healthcare workers to test people with these conditions for the coronavirus. Consequently, 51 COVID-19 cases were discovered by testing people with these symptoms.

Belagavi, meantime, has reported the highest incidents of households with comorbid conditions with 12,427 identified so far, followed by Mandya with 9,289, Kalaburagi with 8,311, Shivamogga with 8,140 and Bengaluru Urban with 7,562. Importantly, 3,45,443 vulnerable people have been identified in Bengaluru Urban within 28.26% of data logged in so far.

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