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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Udupi, Mar 24: Four people, including two women, suspected to have infected with Coron were admitted to the hospitals in Udupi district

According to the District Administration, in all, 51 samples were sent to the laboratory for test and 40 samples have been tested negative.

The result of remaining 11 swabs were awaited.

At least 21 people had been admitted to the isolation wards of hospitals in the district. Nine had been discharged from the isolation wards after they recovered from the health complications on Monday, it further said.

Bengaluru, Apr 8: Heavy rain lashed Belthangady taluk in Dakshina Kannada district and parts of Udupi district on Tuesday providing much-needed relief to the people from the sultry heat.

Belthangady, Guruvayanakere, Madantyaru, Venoor, Naravi and surrounding areas received rain coupled with lightning and thunder. 

Rain also lashed Karkala, Kundapura, Kollur, Siddapura, Gangolli, Hemmady, Uppunda, Shiroor, Hebri and surrounding areas in Udupi district.

Parts of Malnad --- Koppa, Balehonnur and NR Pura taluks in the neighbouring Chikkamagaluru district --- received good rainfall coupled with lightning and thunder.

The rain has brought a smile on the face of coffee growers as it will help in the blossoming of the flowers in coffee plants.

In Kodagu district, heavy rain lashed Madikeri, Hudikeri, Ponnampet, Srimangala, Siddapura, Galiubeedu, Bapoklu, Talacauvery and Bhagamandala.

Parts of Mysuru city and district, Chamarajanagar, and Hassan received a good spell of rain on Monday night, bringing down the mercury levels.

Heavy rain lashed T Narasipur taluk in Mysuru district and the Kothegala Gram panchayat limits received 7 cm rainfall. Karya village in Nanjangud taluk received 5 cm rainfall.

Male Mahadeshwara Hills in Chamarajanagar district received good rain in the evening. 

Meanwhile, the Agriculture Research Station at Naganahalli has predicted thunderstorms, on April 7 and 8 in the region. The research centre recorded 12 mm rain on Sunday night and 22.5 mm on Monday midnight. 

Moderate to heavy rain, accompanied by strong wind and lightning, lashed some parts of Shivamogga district, including Ripponpet, Sorab, Bhadravathi, Thirthahalli, Sagar
and Shikariput. 

Bhatkal in Uttara Kannada district received heavy rain from 4 to 7 pm. The town had also received the rain for about half-an-hour in the morning.

Hosapete town and the surrounding villages also received the rain. At some places, the rain brought down the branches of the trees. The rain has cooled the mercury level at Hosur, Nagenahalli, Basavadurga, Kamalapur, Hampi and other villages in Hosapete taluk. 

Rain also lashed several places in Ballari district, including the Ballari city. Rain, accompanied by hailstones, brought cheers to the people at Kottur. 

Meanwhile, rain and hailstones have destroyed the standing paddy crop in hundreds of acres of land at Maraladinni, Katagal, Uskihal, Belladamaradi and other villages in Maski taluk of Raichur. The farmers are waiting to harvest the crop.