Lockdown: Karnataka to relax restrictions after Apr 21 midnight

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, June 21: As many as 7 fresh cases of covid-19 were detected in coastal district of Dakshina Kannada today whereas neighbouring Udupi did not report any new case. 

The total confirmed covid cases in Dakshina Kannada today mounted to 425. Among them, 227 people have been already recovered and discharged. Today alone 26 were discharged. Currently there are 190 active cases in the district.

In Udupi there are only 102 cases are currently active among 1,063 detected covid-19 cases. So far 959 people have been discharged from hospital after fully recovering from the diseased. Today six patients were discharged.

Dakshina Kannada has so far witnessed death of 8 covid-19 patients. Among them 2 persons lost their lives due to non-covid reasons. Udupi has witnessed 2 covid related deaths so far.

Bengaluru, May 23: Karnataka reported 216 covid-19 positive cases in last 24 hours, marking the highest single day spike in the state ever since the first case was detected on 8 March. 187 of these 216 patients have recently returned from Maharashtra.

A 32-year old male resident of Bengaluru died on Saturday making it the 42nd fatality in the state.

The spike on Saturday takes the total number of covid-19 positive closer to the 2,000 mark and the number of active cases to 1,307 in the state, according to the daily health bulletin of the health department.

Yadgir in northern Karnataka recorded 72 cases on Saturday while Raichur recorded 40 cases. Cases in the sugarcane growing region of Mandya continued to rise as 28 people tested positive on Saturday that takes the total number of active cases to 211 as against Bengaluru that has 124.

Gadag registered 15 cases while Bengaluru recorded 4 cases.

Most of those who tested positive on Saturday had returned from other states, especially Maharashtra, one of the worst affected regions in the country.

The spike in cases comes even as the B.S.Yediyurappa-led state government is deliberating further easing of lockdown restrictions post 31 May. The state government has already resumed public bus and train services as well to facilitate inter-district movement of people that has added to fears of spreading the virus from cities to villages where healthcare infrastructure is poor and inadequate.

Karnataka will also see domestic flight arrivals from Monday.

In a statement on Saturday, Bengaluru International Airport said that it introduced ‘Parking-to-Boarding contactless’ journey.

“We have introduced innovative contactless procedures to minimise exposure at the Airport. These enhancements demonstrate our continued commitment to keep our passengers safe in this environment," said Hari Marar, managing director and chief executive of the airport said in a statement on Saturday.