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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, Mar 19: The Karnataka government has extended the statewide coronavirus shutdown till March 31 as the number of positive cases rose to 14, of whom 11 are those who came in from foreign countries.

In an emergency Cabinet meeting, the state government set up a task force of four ministers to lead the defence against the virus. This core team will have Rs 200 crore to orchestrate the combat.

When chief minister B S Yediyurappa announced the shutdown last week, it was to be in force until March 21, but it was always unlikely that the Covid-19 scare would have waned by then.

Several more restrictions were announced today. Quarantine will be mandatory for all passengers arriving from foreign countries. While schools, colleges and business establishments will continue to be closed, restrictions have been extended to marriages, fairs and social functions as well.

Public entry to Vidhana Soudha, Vikas Soudha and the M.S. Building has been barred till March 31.

While setting up the task force, the government has earmarked Rs 200 crore for the coronavirus campaign. The chief minister said there is no dearth of funds for fighting the virus.

The task force will have deputy chief minister Ashwathnarayana, home minister Basavaraj Bommai, medical education minister Sudhakar, health and family welfare minister B Sreeramulu and chief secretary T M Vijaybhaskar.  Sreeramulu will head the task force.

The task force will monitor coronavirus cases on a daily basis and orchestrate the response of all stakeholders. It will issue a daily bulletin on the epidemic and also run awareness campaigns.

With quarantine now mandatory for passengers coming in foreign countries, community centres, hotels, convention centres, resorts and even PGs will be rented to accommodate the new arrivals.

The compulsory quarantine will be for 15 days.

A quarantine stamp will be imprinted on the right hand of passengers coming in from foreign countries.

Since the Centre has relaxed the rules for using SDRF funds, the state government will draw from it to contain the pandemic; therefore, there will be more funds available to all districts, chief minister B S Yediyurappa said in the Assembly.

In further measures, all passengers and suspected Covid-19 cases will be tracked by their mobile phones.

Primary stage

“We are in the first and second stages of the epidemic. The virus is still at a primary stage and has not spread to community level," medical education minister Sudhakar said in the Assembly.

"It is important that we do not let the epidemic enter the third stage. It is possible if we implement stringent measures. People have responded positively to the state government’s measures and are cooperating with our decisions," Sudhakar said.

Bengaluru, Jun 29: A 99-year-old woman has successfully recovered from coronavirus in Bengaluru, leaving the medical fraternity and her family elated.

The woman had contracted the pathogen after coming in contact with her grandson and was hospitalised on her 99th birthday on June 18.

The woman was taken to the government Victoria Hospital along with her 70-year-old son, daughter-in-law and grandson.

"While we three developed symptoms like cold, cough and fever, my mother remained asymptomatic," the woman's son said.

The family members are still wondering how they got infected by the virus as all except the woman's grandson, were confined to their home most of the time.

Her 29-year-old grandson was the only one who went out to buy groceries.

Initially, the family approached a private hospital nearby for treatment, but they refused to accept COVID-19 patients.

Left with no option, the family got admitted to the Victoria hospital.

"We had reservations about Victoria hospital, but it turned out be a good one.

We did not spend a penny since the day we were admitted and my mother and son fully recovered," the woman's son said.

According to Dr Asima Banu, nodal officer of the Trauma Care Centre at the Victoria hospital, the woman was reluctant to get treatment at the hospital.

"With moral support from doctors and nurses at the Trauma Care Centre, she recovered very fast. She is always positive in life," the doctor said.