Resolution in Kerala Assembly is against unconstitutional Act passed by Centre: CM

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Kasaragod, Jun 2: Kumbala police on Tuesday arrested 20 persons on charges of misbehaving and obstructing a medical team who were on official duty for Covid-19.

Police sources said the incident occurred at Kumbala beach near here on Monday evening when a group of locals misbehaved and obstructed an eight-member medical team, comprising of doctors and health workers, from carrying out a survey to asertain whether there has been a community spread of Covid-19 in that locality.

The health team was on a mission to gather data of people who had interacted with expatriates after they had returned to hometown recently.

Kasaragod, Apr 21: Kerala reported a spike in COVID-19 cases on Tuesday with 19 people testing positive, after a decline in the numbers in the past few days, as the total infections touched 426 in the southern state.

Kannur recorded 10 cases, Palakkad four, Kasaragod three and Malappuram and Kollam one each, Chief Minister Pinarayi Vijayan told reporters here.

The number of those getting infected were in single digits over the past few days.

Of the 10 positive cases from Kannur, nine of them had come from abroad and one had been infected through contact, he said.

Pointing out that the positive cases in Palakkad,Malappuram and Kollam had come from neighbouring Tamil Nadu, Vijayan said there is need to enforce strict vigilance in places bordering neighbouring states.

Sixteen people tested negative on Tuesday, while the total active cases 117, he added.

At least 32,000 people are under observation,

Of the around 20,000 samples sent, 19,440 had returned negative, Vijayan said.