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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, May 18: A large number of people in India are planning inter-city bus travel within a month of the lifting of travel restrictions, according to a randomised online survey of over 10,300 customers of redBus, India's largest online bus ticketing platform.

Nearly 57 per cent of the respondents are planning to travel within a month post the lockdown. However, there is a high standard of expectation on the implementation of measures to make buses safe for travel with over 79 per cent wanting deep cleaning and sanitisation of buses after every trip.

Hand sanitisers, mandatory masks and temperature screening for all passengers are next in expectations for bus travel. Over 78 per cent of the respondents want the implementation of hygienic conditions at boarding points and 70 per cent want social distancing protocols to be implemented at boarding points.

"The survey does underscore the fact that given the adherence to safety protocols, bus travel is possibly one of the safest options for travel since the number of travellers are fewer, checks can be done individually and the whole factor of pick up and drop as close to home as possible minimises the number of contacts throughout the journey," said redBus Chief Executive Officer Prakash Sangam.

In addition, online booking further reduces the number of contact points as people can book bus tickets directly from their home. Further, there is a heightened awareness of personal hygiene and safety measures which is important for the travel to be safe.

"The large number of people waiting to travel not only points to the need but also the importance it has for the revival of economic activity as very few of them would be travelling for leisure," said Sangam.

The survey also showed that passengers put a very high consideration on hygiene, sanitation and disinfection -- over 73 per cent -- and social distancing (63 per cent) and much lower consideration to traditional factors such as travel cost (22 per cent), comfort (21 per cent) and punctuality (18 per cent).

The survey was conducted among redBus customers across India. Only 5 per cent of the respondents were willing to postpone their travel to over six months while the rest had plans to travel within that period.

Mangaluru, May 22: Dakshina Kannada today reported a fresh case of coronavirus infection, taking the coastal district's tally to 62. 

The new patient is a 29-year-old womon, who was under instituional quarantine monitored by the district administration in Belthangady. 

She had returned from Mumbai on May 18. Her throat swabs were sent for covid-19 testing on the following day and today she received positive result.

Out of the 62 covid-19 cases detected in Dakshina Kannada so far, only 50 are residents of the district. Among 12 others 4 are from Kasaragod and 3 from Karkala, 2 each from Uttara Kannada and Mumbai, and 1 from Kalaburgi.