Two brothers killed as speeding bus rams into auto-rickshaw in Karkala

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

New Delhi, Jul 3: The aviation regulator DGCA said on Friday it was extending the suspension of scheduled international passenger flights in the country till July 31 but added that some international scheduled services on selected routes may be permitted on a case to case basis.

Scheduled international passenger flights were suspended in India on March 23 due to the coronavirus pandemic.

Modifying its June 26 circular that stated that scheduled international passenger flights will remain suspended till July 15, 2020, the regulator stated on Friday it has decided to extend the deadline to July 31, 2020.

However, international scheduled flights may be allowed on selected routes by the competent authority on a case to case basis,” said the circular by the Directorate General of Civil Aviation (DGCA).

Air India and other private domestic airlines have been operating unscheduled international repatriation flights under the Vande Bharat Mission, which was started on May 6 by the Central government.

India resumed scheduled domestic passenger flights on May 25, after a gap of two months.

Mangaluru, June 29: As many as 32 fresh covid positive cases were reported in Dakshina Kannada today. In Udupi 18 new positive cases were reported. 

In Dakshina Kannada out of the 32 positive cases, one had returned from another state. Ten persons had contracted the disease from patient number 9590, 10274, 10275, 9739, 9589, 12384 and 10582.

Nine persons are suffering from influenza-like illness (ILI), and Six others are suffering from Severe Acute Respiratory Infection. The health officials are tracing the contacts of five others.

In Udupi, out of 18 positive cases, 5 had travelled from Maharashtra, four had travelled from Bangaluru and nine others had contracted the virus from the COVID Positive patients.