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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Kannur, Mar 29: A non-resident Keralite (NRK)

under home quarantine here since he returned from Sharjah recently died on Sunday, officials said.

According to health authorities, Abdul Khader (65), a resident of Kannariparamba, was kept under home quarantine after he returned from abroad on March 21.

Police said the man had no symptoms of coronavirus but was under isolation as per Covid-19 protocol for persons returning from abroad and other states.

"The relatives of the deceased took him to hospital after seeing him unconscious in his room. However he died before reaching the hospital," police said.

Quoting medical college authorities, the Mayyil police said he died of cardiac arrest.

However, the health officials said they will test his blood sample to ascertain whether he was affected with novel coronavirus.

The body has been kept at the Kannur medical college and will be handed over to his kin only if the result of his blood test is negative, sources said.

Udupi, Jun 9: Karnataka Minister for Primary and Secondary School S Suresh Kumar on Tuesday ruled out the possibility of either postponing or cancelling SSLC exam in the State and it will start from June 25 as scheduled.

Replying to a question, the Minister said that Telangana and Tamil Nadu States might have cancelled the SSLC exam, but Karnataka will not follow them. "Will hold the examination from June 25 to July 4 by taking all care to protect the interests of the Children.

The SSLC exam was originally scheduled for March 27, but was postponed as lockdown was clamped following the spread of killer Coronavirus.