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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jan 5: Against the backdrop of Mangalore violence of December 19, Additional Director General of Police of Karnataka Amar Kumar Pandey visited the city and held a meeting with senior police officers.

According to senior police officials here on Sunday, Dakshina Kannada and Udupi District Muslim Central Committee had planned to hold a protest against CAA at Nehru Maidan while the SKSSF had called for anti-CAA protest at State Bank area.

Though both the protests had been called off, there was an apprehension of a repeat incident of December 19 violence and hence the ADGP visited the city at the behest of state government and monitored the situation here for the entire day on Saturday.

The ADGP was unhappy that despite initial inputs and the imposition of Section 144 in the city, the situation on that day escalated to a level where police had to resort to firing only in this city.

Bengaluru, Jul 3: The Karnataka government is allowing select asymptomatic and mildly symptomatic Covid-19 patients to recuperate at home as part of home isolation guidelines, an official said on Friday.

"Only those who are asymptomatic or mildly symptomatic shall be allowed to be in isolation at home," said a health official, highlighting that such patients should be properly oriented on home isolation.

However, before home isolation, a health team will visit the patient's house and assess its suitability for executing home isolation.

Similarly, the patient should be provided with a tele-consultation link for initial triage, daily follow up and during the entire home isolation time.

For a daily update, the patient isolated at home should give a report on his health status to the physician or health authorities.

"The home isolation shall be with the knowledge of the family members, neighbours, treating physician and local health authorities," said the official.

Though home isolation is allowed, it is not a blanket permission for all asymptomatic and mildly symptomatic cases in Karnataka to avail.

"Such cases should have the requisite facility at their residence for self-isolation and also for quarantining the family contacts. A care giver should be available to provide care on 24x7 basis," said the official.

Likewise, the caregiver should also have a regular communication link between him and the hospital during the home isolation.

No patient above 50 years will be allowed to avail home isolation.

"If the patient has the following comorbidities: hypertension, diabetes, obesity, thyroid disease, they shall be well managed and under good clinical control as assessed by medical officer," he said.

However, patients with comorbidities such as kidney diseases, dialysis, heart diseases, stroke, tuberculosis, cancer and HIV cannot avail home isolation.

Likewise, immunity compromised patients and those on steroids also cannot be on home isolation.

Though pregnant women are not allowed to avail this facility, lactating women are allowed after due instruction and assessment.

The Health Department has also issued several other guidelines and protocols for a patient choosing home isolation.