Facebook post helps stranded Kalladka youth in Saudi Arabia return home safe

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, Jul 23: The Siddi community in Karnataka got its first lawmaker as Governor Vajubhai Vala nominated five persons, including Shantharama Budna Siddi, to the Karnataka Legislative Council on Wednesday.

Shantharama Siddi had been working as a social worker and was a post holder at the Vanavasi Kalyan Prakalpa, a tribal welfare initiative of the Rashtriya Swayamsevak Sangh (RSS).

The Siddis, an ethnic group in India, are said to have descended from the people of the East African region. They are included in the list of Scheduled Tribes (ST) in Karnataka.

Apart from the Shantharama, the inclusion of CP Yogishwar, who had left Congress to join BJP in 2017 but failed to retain his seat in the 2018 Assembly polls, is also considered as a big decision.

Adagur H Vishwanath, another former JDS leader, who had quit his party and joined BJP but failed to retain his seat has also caught the attention of the people.

Further, Governor Vala has nominated Talwar Sabanna and Bharathi Shetty to the Upper House in the state.

Mangaluru, May 27: Karnataka’s twin coastal districts of Dakshina Kannada and Udupi today reported 11 and 9 fresh covid-19 cases respectively.

In Dakshina Kannada the covid-19 patients include seven women and four men who had recently come from Maharashtra.

One of the patients is a 3-year-old child. Others are girls aged 11 and 17, women aged 36, 37, 45, 59 and men aged 22, 35, 39 and 46.

All of them have been shifted to covid-19 hospital from different institutional quarantine centres. 

In Udupi too all the nine people – six men, a boy, and two women -  had come from Maharashtra a few days ago.