Amit Shah accorded warm welcome at Mangaluru Airport, proceeds to Kerala

Kasaragod, Apr 17: Even as this district continue to remain in the high-alert red zone category of Covid-19, Kasaragod has slowly but steadily been limping back to restraint level of the pandemic from a possible slipping into a stage-3 of community spread early this month.

Thanks to the stringent and committed measures implemented by the district administration crisscross the district besides total isolation of few localities by enforcing triple lockdown.

The district had been a Covid-19 hotspot ever since an NRI who returned from the Gulf violated quarantine protocol and travelled wide and far by meeting and contacting with several people including two MLAs of the district. That apart the irresponsible attitude of the people who broke the rules of quarantine and lockdown norms also made things go from bad to worse resulting in contributing for a near-half of the total positive cases in the state at the beginning of April.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 3: The Dakshina Kannada district administration’s decision to ban use of private vehicles, excluding permitted categories, from Friday for effective implementation of lockdown, began showing results since morning itself.

Mangaluru City Traffic Police and Dakshina Kannada district police erected several pickets at vantage places on arterial roads to check those moving without a valid reason. Several two-wheelers were seized during the checking while a few car drivers were let off with a strict warning.

Assistant Commissioner of Police (Traffic), M Manjunatha Shetty, who was supervising a picket at Hampankatta, said that movement of private vehicles has drastically reduced in the city.