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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 9: A team of doctors at Mangaluru's Mangala Hospital has developed a 'bubble helmet' that will provide an alternative to patients who need an oxygen mask.

The team was led by Dr Ganapathi, medical director of Mangala Hospital and Mangala Kidney Foundation in the city.

The bubble helmet, which has a special collar attached to it, helps the patients with breathing issues, and to avoid using ventilator facility.

Dr Ganapathi said, "When a patient needs intubation we will be providing them oxygen bubble helmets and we will first give it a trial before we intubate a patient."

"I have converted an ordinary snorkelling mask into a ventilator assist device, this mask can be used as a personal protection device by connecting it to a bacterial viral filter," he added.

Dr Ganapathi said that the connector has been made available in India and a snorkelling mask can be easily converted into a ventilator assist device. And it will make the management of coronavirus patients easy.

Bengaluru, Jun 24: Three weeks after the BMTC resumed running air-conditioned buses in the state capital, the state-owned Karnataka State Road Transport Corporation (KSRTC) has announced plying AC buses to eight cities to begin with, including to Mangaluru and Mysuru, from Thursday.

From tomorrow travellers can travel to Mysuru, Mangaluru, Kundapura, Madikeri, Chikkamagaluru, Davanagere, Shivamogga and Virajpet in AC buses, KSRTC said in a statement released here.

Listing out the measures taken to check the spread of Covid-19, the Corporation said that the temperature inside the buses will be maintained at 24 to 25 degrees Celsius and no blankets will be provided in the night service buses.