Monsoon rain throws life out of gear, uproots trees, raises river levels in DK, Udupi

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jul 7: The residents of Bangle Gudde, Mathadagudde area in Gurupura Gram Panchayat in Dakshina Kannada district of Karnataka, where two teen aged children were buried alive, were shifted to safer places.

District officials said on Tuesday that the residents have been provided temporary shelter in Gurpur school, PU college, and hostels, while few others were shifted to Ashraya centers. Total 40 houses out of 180 houses in this area located in the red zone were damaged due to heavy rain.

If the residents want to stay in the rented house, the revenue department is ready to pay a sum of Rs 2,500 towards rent, official sources said.

Bengaluru, May 18: Karnataka Chief Minister BS Yediyurappa on Monday said that people from Gujarat, Maharashtra, Kerala and Tamil Nadu will not be allowed in the state till May 31.

"We have decided not to allow entry of people from Gujarat, Maharashtra, Kerala and Tamil Nadu till May 31," Yediyurappa said after a meeting with state ministers and senior government officers to discuss the guidelines issued by the Centre regarding the fourth phase of nationwide lockdown.

"State road transport corporation buses in Karnataka and private buses will run. Strict lockdown measures in containment zones and economic activities will be permitted in other areas. Sundays will be total lockdown across the state. Home quarantine will be strengthened," he added.

The Chief Minister further said that all shops will be allowed to open and all trains running within the state will be permitted.

The central government on Sunday extended the ongoing COVID-19 induced nationwide lockdown till May 31, but with a set of new relaxations commencing from Monday. The Union Home Ministry has also given powers to States/UTs demarcate areas in Green, Orange and Red zones, which will allow them to start activities except in containment zones.

According to the guidelines, "all other activities will be permitted except those which are specifically prohibited under these guidelines. However, in containment zones, only essential activities shall be allowed, as mentioned earlier."