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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, May 15: Dakshina Kannada saw a record spike in the number of fresh COVID-19 cases today, which triggered panic among the people of the district, which is currently under orange zone.   

According to the mid-day bulletin of the Department of Health and Family Welfare, as many as 16 people from Dakshina Kannada tested positive for the covid-19. 

Among them 15 are the Gulf returnees who were brought by an Air India Express special flight from Dubai to Mangaluru International Airport on May 12. 

As many as 179 repatriates had landed at Mangaluru Airport. Among them 125 are quarantined in Dakshina Kannada, 49 in Udupi and five in Uttara Kannada districts.  

Meanwhile, a 68-year-old woman from Surathkal area in Mangaluru, who is suffering from Severe Acute Respiratory Infection (SARI) was also tested covid-19 positive.

This is the highest number of cases reported in a single day since first case registered in the district on March 22 when Dubai-bound youth from Bhatkal was tested positive. 

With this the total number of covid-19 cases in the district mounted to 50 including five deaths. Many of them have returned home after recovery.

3 members of a family test positive

According to Deputy Commissioner Sindhu B Rupesh, three members of a same family are among 15 gulf returnees who are tested positive.  They are a 45-year-old man, his 33-year-old wife and their 6-year-old child. 

Six among those who tested positive today are above 60 years of age, said the deputy commissioner. 
 

Mangaluru, Mar 26: The district Wenlock hospital in

the city will be turned into a dedicated hospital for the treatment of COVID-19 patients, Dakshina Kannada district-in- charge Minister Kota Srinivas Poojary said on Thursday.

Addressing reporters here, he said the 250-bed super speciality wing at Wenlock would be converted to a dedicated hospital to treat coronavirus patients in view of the prevailing situation.

The 20-bed Ayush block will be used for the treatment of suspected cases.

The patients currently being treated for various other ailments at the hospital will be shifted to private hospitals within three days.

The expenses for their treatment will be borne by the government, he said.

The 705 beds available at the hospital wards will be used for coronavirus cases in a phased manner.

The patients visiting the outpatient ward will be directed to go to nearby medical colleges for treatment, he said.

A total of 140 children being treated at the regional advanced paediatric care centre at the hospital will be shifted to nearby medical college hospitals.

The centre will also be used for covid-19 treatment.

Poojary said at present five COVID-19 patients and 140 suspected cases are being treated at the Wenlock hospital.