Home stay attack: Court discharges journalist Naveen Soorinje from all charges

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Udupi, June 2: The number of positive cases may continue to be more in Udupi district since the results of more than 3,000 samples are pending with Labs.

The district total cases to 260. The figure had seemed far-fetched on May 15, when the number of cases stood at just three. The latest spike has been attributed to the return of migrants from other States as well as from abroad. These samples are from people who returned to the district in the last two weeks.

This delay is because the laboratories testing samples from Udupi are burdened with a high case-load after more than 8,500 people returned to the district, particularly from the neighbouring state of Maharashtra.

"Samples have piled up after the influx of people returning from other states and from abroad," says Dr Prashant Bhat, nodal officer for COVID-19 in Udupi. This delay has caused returnees in institutional quarantine to stay on for as long as 18 days.

The designated laboratory for coronavirus testing in Udupi is Wenlock District Hospital in Mangaluru. The district administration also sends samples to laboratories at the Kasturba Hospital in Manipal, Yenepoya Medical College, Mangaluru, KS Hegde Medical Academy, Mangaluru, and Viral Diagnostic Laboratory in Shivamogga. Apart from Udupi, the laboratory in Manipal is also testing samples from Uttara Kannada district. The laboratory in Shivamogga is also testing samples from Shivamogga and Bijapur districts. The laboratories in Mangaluru, similarly, have samples from Dakshina Kannada district.

Dr Avinash Shetty, Medical Superintendent of Kasturba Hospital in Manipal, one of the private laboratories being used by the Udupi district administration, said that they are testing samples in batches. "We received around 600 samples today and we will be testing them now. The backlog of samples should be cleared in the next few days," Dr Avinash said.

All 73 cases reported in Udupi on Monday were patients with travel history of returning from Maharashtra or patients with travel history of returning from abroad.

In cases of some patients who tested coronavirus positive in the past week, people were released from institutional quarantine after a stipulated period only to be tracked down again and admitted in hospitals after their results returned positive.

While two such cases emerged in Belapu and Belman in the district, the administration is now following up with others who were released from institutional quarantine to ensure they remain in home quarantine till their test results are confirmed.

The spike in cases among returning migrants in Udupi also comes at a time the Karnataka government reduced restrictions on interstate travel.

Bengaluru, Jun 22: Concerned over the increase in COVID-19 cases in the city, Karnataka Chief Minister B S Yediyurappa on Monday directed officials to implement lockdown measures strictly in the clusters which have reported more infections.

Yediyurappa held a meeting with Ministers and senior officials regarding containing COVID-19 in Bengaluru and said it can be achieved only if preventive measures are implemented strictly and asked the officials to work in this direction.

"Lockdown shall be implemented strictly in the clusters which reported more cases, especially, K.R. Market and surrounding areas such as Siddapura, VV Puram, Kalasipalya etc. It was decided to seal the adjoining streets, where the cases are reported, a release from the Chief Minister's office said. Stringent action would be taken against those who violate quarantine norms and FIR would be filed if necessary, it said.

Till Sunday evening, the state capital has reported 1,272 cases of COVID-19, including 64 deaths and 411 discharges. On Sunday, as many as 196 fresh cases were recorded. Officers were directed to ensure hygiene and provide other basic amenities to the people who were quarantined in the social welfare department's hostels and other government institutions.

"COVID-19 should be contained without affecting the economic activities in Bengaluru, which resumed recently," the Chief Minister said.

Noting that booth-level officers and volunteers were working to trace contacts and monitor quarantined persons, he said the COVID war room shall have real-time information on the availability of beds in various designated hospitals and facilitate treatment to the infected without loss of time.

A bulletin from the Bruhat Bengaluru Mahanagara Palike (BBMP), the city civic body, said there were 298 active containment zones in the city. BBMP Commissioner B H Anil Kumar along with the Chamarajpet Congress MLA B Z Zameer Ahmed Khan visited a few slum areas in the city to take stock of the COVID-19 situation, officials said.