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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Karwar, Jun 3: The India Meteorological Department (IMD) has issued an alert, predicting thundershowers and heavy rainfall over north interior Karnataka, coastal Dakshina Kannada and Udupi over the next three days.

With Cyclone Nisarga hitting the Uttara Kannada coast on Tuesday,  parts of coastal Karnataka received heavy rainfall. Gusty winds tore through the coastal towns, as the sea too turned violent with rough waves smashing the shore.

The alert was issued with the advancement of Nisarga from east-central Arabian Sea to north Maharashtra, and adjoining south Gujarat coast. “Though it does not cover Karnataka, the range of cyclonic winds is very big and reaches north interior Karnataka also.

So an alert has been called out,” CS Patil, director in-charge, IMD, Bengaluru, said. The weather department has forecast a severe cyclonic storm and then a depression. Patil said formation of systems is a common factor before the onset of the monsoon and they help in its advancement.

“Cyclone Nisarga is helping in the quick advancement of the southwest monsoon to Karnataka, and the monsoon is likely to arrive before the scheduled date as conditions are favourable,” he added.

Kochi, Jan 21: Eight tourists from Kerala were found dead in a resort at Daman in Makwanpur district of Nepal, reports said. The dead include a couple and four minor children.

The deceased were identified as Praveen Kumar Nair (39), Saranya (34), Ranjith Kumar T.B (39), Indu Ranjith (34), Sreebhadra (9), Abhinav Soorya (9), Abhi Nair (7) and Vaishnav Ranjith (2).

The deceased are from Chengottukonam in Thiruvananthapuram and Kundamangalam in Kozhikode. Praveen, a travel enthusiast hailing from Chengottukonam, went on the Nepal trip with his wife, three children and friends from Kochi, last week.

 “They were using a gas heater in the room. Suffocation might have caused their death,” said superintendent of police Sushil Singh Rathore of the District Police Office in Makwanpur, news agencies reported.

According to newspaper reports here, the deaths occurred at a resort named Everest Panorama. They were airlifted to HAMS hospital where they were pronounced dead on arrival, superintendent of police Sushil Singh Rathaur said.

They were part of a group of 15 people travelling from Kerala to Pokhara, a popular mountain tourist destination, The Himalayan Times reported.

They were on their way back home and stayed at Everest Panorama resort in Daman in Makawanpur district on Monday night.

The tourists are suspected to have died of asphyxiation after turning on the gas heater and shutting all the windows to keep warm.  Hotel staff opened the room using duplicate keys as there was no response from the rooms when the other members of the group went to check on them.

According to the manager of the resort, the guests stayed in a room and turned on a gas heater to keep themselves warm. Although they had booked a total of four suites, eight of them stayed in a room, the manager said, adding that all the windows and the door of the room were bolted from inside.

“All arrangements have been made to bring the bodies to Kerala at the earliest. The Union government is coordinating with the Indian Embassy in Nepal. A doctor from the Indian embassy will be present during the post mortem. Other members of the group are being brought to Kathmandu by road,” said Union minister V Muraleedharan.

Chief minister Pinarayi Vijayan said that NORKA will coordinate with Nepal authorities to bring dead bodies.

 “Embassy officials are at the government hospital where a post mortem is being done. Formalities will be completed at the earliest and arrangements are in place to bring dead bodies by Wednesday evening. State government is in constant contact with Nepal authorities,” said Kadakampally Surendran, tourism minister.