Suresh Neramballi - an unsung Mangalurean hero in Kuwait

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Mar 18: BJP MLC Lahar Singh Siroya on Wednesday wrote a letter to Karnataka Chief Minister B S Yeddyurappa, urging him to allow half-an-hour daily discussion in the State Assembly and Council to take stock and review preparation of the government to contain the spread of coronavirus.

"Since the entire world including India is facing an emergency-like situation, it is appropriate for lawmakers to discuss the matter in the legislature. I would like to request you to allow the matter to be discussed every day in the upper house," said Siroya in his letter to the Chief Minister.

He said discussion and suggestions on the issue can help the government to improve the surveillance activities.

He said members of the Assembly can bring realistic information from their districts and present the same before the House.

Stressing that Bengaluru is a global hub of software and electronic industries, Siroya said: "We need to step up surveillance on the improvement of the international community. So, we have to discuss in detail and devise a robust strategy to contain the spread of the disease."

He asserted there is a possibility of people using social media to mislead public.

"lf the government discusses and debates the issue besides making announcements if any, there will be no scope for social media to mislead the public. Media is doing a good job in educating people. So, I would like to request you to involve the media and select NGOs to sensitise people and bring in the preventive mechanism of self-quarantine more effectively," he said.

Two more people have tested positive for COVID-19 in Karnataka on Wednesday, taking the tally of infected persons in the state to 13, Health Minister B Sriramulu said.

A total of 147 positive cases of coronavirus have been reported in India so far, as per the Union Ministry of Health and Family Welfare. The deadly virus has claimed three lives in the country, the first one was reported from Karnataka.

Bengaluru, Jun 4: All shops, offices, malls, commercial establishments and others in Karnataka must not allow Covid-stamped people to enter their premises before the completion of the prescribed quarantine time, said a top official on Wednesday.

"They should not allow those with quarantine stamp to enter before the end of their quarantine period or till they get current Covid negative test report," ordered Chief Secretary T.M. Vijay Bhaskar.

Bhaskar has also issued the order to all religious places, hotels and others to first check for quarantine stamp on all their customers or visitors before they enter the premises.

"All shops, commercial establishments, offices, factories, malls, religious places, hotels and etc.. are required to check for quarantine stamp on all their customers or visitors before they enter the premises," he said.

In the event of a violation, Bhaskar said the police should be informed at 100.

He issued the same order to the general public and resident welfare associations asking them to be vigilant.

"General public and resident welfare associations are advised to report any violation of the quarantine in their neighbourhood to the police at telephone number 100," said the chief secretary.

The orders came under the head aRole of general public, resident welfare associations and commercial establishments''.

General public, commercial establishments and resident welfare associations have been empowered to report quarantine violations at a time when many activities are set to reopen from June 8 as part of Unlock - 1, after more than two months of lockdown.