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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

New Delhi, Apr 12: Ramping up efforts to "stamp out" coronavirus cases in the state, Kerala Finance Minister Thomas Isaac has said that not only lockdown but intense testing of people and tracing of their contacts are also equally important in the fight against the outbreak.

Kerala, which was the first state in the country to report a coronavirus infection in late January, has also prepared a time table for coming out of the lockdown and there would be district-specific strategies to tackle the situation while the number of cases are on the decline.

In efforts to curb spreading of coronavirus infections, the country is under a 21-day lockdown till April 14 and many states have sought an extension amid rising number of cases. Kerala has proposed extending the lockdown and gradual phasing out after proper assessment.

"Lockdown should go on till we stamp out entire infections. Now, it is not enough to have lockdown. Equally important is that we should have intense testing, tracing and isolating (of people with coronavirus infections)," he said in a telephonic interview.

The government is closely monitoring the situation and there would be region-specific or district-specific strategies in place to tackle the outbreak, he said.

Against the backdrop of the lockdown that has also disrupted economic activities, Isaac said an exit strategy is being prepared and restrictions are being relaxed in certain segments, including agriculture.

Coronavirus India update: State-wise total number of confirmed cases, deaths on April 12

"The number of patients is coming down (in the state). We hope that in the coming days, the decline will be much more faster," he said during the interview late Friday.

On Saturday, the Kerala government said there were a total of 373 confirmed cases of coronavirus infections and 228 patients were under treatment in various hospitals in the state.

Keeping the trend in the last few days, the number of people under observation has come down to 1,23,490. So far, 14,613 samples from people with symptoms were sent for testing and the results of 12,818 samples have come negative, the government said in a statement on Saturday.

Indicating that there would be a calibrated exit from the lockdown, Isaac said the withdrawal would depend on three main factors, including the count of cases and the percentage of people who are under observation.

While emphasising that people must also be fed during the lockdown period, Isaac also said a time table is being prepared by the state to come out of the lockdown.

Even as strict measures are being implemented to deal with the current situation, the state is also preparing for a possible third wave of coronavirus cases.

Three students, who had returned from the Chinese city of Wuhan, were tested positive. They were also the first such cases, to be reported in January-February period, and have recovered. Wuhan was the epicentre of coronavirus infections before it spread to other countries.

Later, there was a second wave of infections in Kerala.

According to the minister, the possibility of a third wave has also been considered for the exit strategy.

"A lot of Malayalees are expected to come back from outside the state. We will welcome them... before that, we want to stamp out all Covid cases in Kerala. Flatten the curve completely so that when these people from outside, they will be quarantined, they will be tested and only then they will be able to integrate with the rest of the community," he said.

The Kerala government's measures, including extensive testing and efforts to trace people who came in contact with coronavirus-infected persons, have helped in curbing spreading of infections.

The state's public healthcare system has also been appreciated in various quarters.

"People are health conscious. There is a demand for quality healthcare services and the response to this demand has been strengthening of the public healthcare system. We have a robust public healthcare system," the minister emphasised.

On April 9, Isaac tweeted about low level of coronavirus spreading in the state.

"International norm for Covid spread is 2.6 per 1 Covid patient. Total number of primary Covid infected who arrived in Kerala from abroad is 254. The secondary spread has been limited to 91. The international mortality rate is 5.75. With just 2 deaths, rate in Kerala is 0.58," he had tweeted.

Death toll due to the coronavirus increased to 273 and the number of cases to 8,356 in the country on Sunday.

Jan 6: A Thane resident lost a little over Rs 1 lakh in an online fraud involving popular payment gateways, police said on Saturday. The complainant, a resident of Patlipada, wanted to sell his furniture and posted an ad on Facebook on December 21, an official said.

On December 24, he received a call from one Rajendra Sharma who offered to buy the furniture and wanted to transfer the amount through payment gateways — Paytm and Google Pay, he said.

However, instead of the money getting credited to his account, the complainant found that Rs 1.01 lakh were debited from him during three transactions on two payment gateways, the official said.

The complainant realised that he had been cheated when the accused assured that he would return the money and asked him for another account number, he added.

An offense has been registered against the unidentified accused under section 420 (cheating) of the Indian Penal Code and Information Technology Act and further investigations are underway, he said.