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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, July 25: A 105-year-old person from Bengaluru’s Basaveshwar Nagar, who was under treatment for covid-19 at a hospital for past five days, breathed his last today. He was a former government account who retired in 1973. He was the oldest known covid-19 patient in the state so far.

Many members of the patient's family are said to be infected and are hospitalised at various facilities. The funeral will be overseen by two uninfected family members.

The patient 74411 died on Saturday morning at around 9 a.m., said Dr Prasanna, Managing Director of Pristine Hospital And Research Centre where the former was admitted.

“The patient was initially doing well when he admitted on July 20. He did not have significant lung changes when he was admitted. However, after three days, his blood pressure started to drop so he was put on oxygen in the ICU. Yesterday morning, with continued deterioration, he was placed on non-invasive ventilator support,” Dr Prasanna said.

“Finally, by last night, his oxygen saturation levels began to plummet abruptly and we had to intubate him for ventilator support. His condition continued to deteriorate, however. The cause of death was respiratory failure and the onset of sepsis,” he added.

Although earmarked for supplies of Remdesivir by the government, the hospital did not receive the drugs. An appeal to Dr K Sudhakar, Minister of Medical Education by the hospital staff resulted in an assurance that the medication would arrive. “However, in the end, we had to source the medication ourselves on Friday,” medical staff said.

Dr Thrilok Chandra, Head, Critical Care Support Unit (CCSU), which oversees the care of critical or vulnerable-aged Covid-19 patients, had said that Patient 74411 had been diagnosed early. “He was identified when the disease was still in the early stages in his body. He only had symptoms of Influenza-Like Illness (ILI), so the symptoms were not severe,” Dr Chandra had said.

“It’s very sad. We were rooting for him to pull through. He had no comorbidities at all. He had been bed-ridden from last year, but he was healthy. His only potential comorbidity was his advanced age,” Dr Prasanna said.

According to government data, 34% of Covid-19 fatalities in India are aged between 60 and 74 years of age. Fourteen per cent are aged above 74.

Bengaluru, May 10 The asymptomatic and healthy people among international passengers will now have to undergo institutional quarantine for 14 days, according to the new standard operating procedure (SoP) issued by the Karnataka government for a third time.

The SoP, which has been revised twice, was issued by the Health and Family Welfare Department on Saturday, May 9.

The international passengers will be divided into two categories upon their arrival at the airports. Symptomatic will be directly sent to the covid-19 hospitals. Asymptomatic will not be allowed to go home directly. They will be sent for mandatory quarantine for 14 days in hotels and guest houses. 

Earlier, international passengers had to undergo seven days of institutional and seven days of home quarantine.

Passengers will also be tested only twice — once on arrival and for the second time on the 14th day — instead of the earlier decision to test thrice. They will be discharged from the facility if they test negative.

The first group of 350 people are expected to arrive from London at 3 am on Monday at the Kempegowda International Airport, said Lakshman Reddy, Joint Director, Social Welfare Department. 

Flights are expected from Singapore on May 13, Jeddah on May 14 and San Francisco on May 15. 

Among the stranded include 4,408 tourists and visitors, 3,084 students, 2,784 migrants and 557 ship crew.