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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Global oil markets remained under intense pressure on Tuesday, with Brent crude dropping below $20 per barrel for the first time in 18 years while other major benchmarks across the world tumbled. 

Brent, the international crude marker, slipped to $18.10, indicating that markets see no immediate let-up to the collapse in oil demand that sent some US oil benchmarks plunging under $0 for the first time on Monday, leaving producers paying for buyers to take their oil away while available storage is scarce.

Coronavirus has sent the oil sector into a state of crisis, with lockdowns implemented by authorities to smother the outbreak slashing demand for crude by as much as a third.

Contracts for the US benchmark West Texas Intermediate for delivery next month tumbled as low as minus $40 a barrel on Monday. Analysts at Citi warned that “if global storage worsens more quickly, Brent could chase WTI down to the bottom”.

The collapse in the May WTI contract was partly a technical product of the fact that it expires on Tuesday, meaning trading volumes were low and making the contract for June delivery more noteworthy, analysts said. That contract held above $20 a barrel on Monday but slid as much as 42 per cent on Tuesday to trade at lows of $11.79, suggesting the blowout in the May contract was more than a blip and that the entire global oil market faced challenges.

Goldman Sachs analysts said the June contact was likely to face downward pressure in the coming weeks, pointing to the “still unresolved market surplus”.

“As storage becomes saturated, price volatility will remain exceptionally high in coming weeks,” they said. “But with ultimately a finite amount of storage left to fill, production will soon need to fall sizeably to bring the market into balance, finally setting the stage for higher prices once demand gradually recovers.”

Warren Patterson, head of commodities strategy at ING, said it was likely that “storage this time next month will be even more of an issue, given the surplus environment”.

“And so in the absence of a meaningful demand recovery, negative prices could return for June,” he added.

European equities traded lower, partly dragged down by weaker energy stocks. The continent-wide Stoxx 600 was down 1.9 per cent, with its oil and gas sub-index dropping 3.3 per cent. In London the FTSE shed 1.7 per cent, while Frankfurt’s Dax slid 2.3 per cent. 

Equities were also broadly lower in Asia, with futures tipping US stocks to fall 1 per cent when trading in New York begins later.

On Wall Street overnight, the S&P 500 closed down 1.8 per cent, partly because of weakness in energy shares, but also due to increased pessimism over the time it will take for countries to emerge from lockdowns.

In fixed income, the yield on the 10-year US Treasury fell 0.03 percentage points to 0.585 per cent as investors retreated to the safety of the debt.

Mar 11: The Karnataka government on Wednesday started a campaign called 'Namaste over Handshake' that encourages people to greet in the traditional Indian style, to tackle the spread of coronavirus.

The campaign also includes health advice on how people can protect themselves from the infection by adopting hygiene practices such as regularly washing hands to prevent the spread of COVID-19.

As part of the campaign, the state health and family welfare department has uploaded a poster on the social media, featuring a 'Bharatnatyam' dancer draped in a red saree saying 'Namaste'.

"Use Namasthe to greet others, fight against corona" read a message on the poster online.

The poster has health helpline numbers (104 and 011- 23978046) for public queries on the viral disease, which has claimed 4,251 lives worldwide.

A health department official told PTI that as part of the campaign, posters have been uploaded on social media and it would be printed and despatched to different districts to be put up at important junctions.

"We had been working on this idea. Kerala has already done it. They are using Kathakali dancers whereas we are using a Bharatanatyam dancer as our model," the official said.

Medical Education Minister K Sudhakar too had insisted that people should adopt 'Namasthe' or 'Namaskara' to greet people instead of handshakes or hugs.