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Bengaluru, Jun 30: To instill confidence among its commuters, the Karnataka State Road Transport Corporation (KSRTC) has decided to put stamp on hand of all passengers before they are allowed to board the buses.

In a statement issued here on Tuesday, The decision was taken in the wake of a sudden jump in the number of COVID-19 cases reported from Bengaluru.

The round stamp is, however, different from 'home-quarantine' stamp applied to infected and they were not allowed to travel. Officials said that the measure is aimed at reassuring passengers that those travelling with them do not have symptoms. The left hand will be stamped with an ink which can be washed away by the time they reach home.

Bengaluru, Apr 4: Karnataka Chief Minister B S Yediyurappa has appealed to employers not to cut salaries of their maids, servants and drivers who are unable to attend work due to the current lockdown situation in the country.

He said compassionate gesture of employers will support the poor and needy.

"I request all the employers not to cut salaries of their maids, servants, drivers etc., who are not able to work due to social distancing. Your compassionate gesture will support the poor and needy to overcome this hard time. FightBackKarnataka CoronavirusPandemic," the Chief Minister said in a tweet.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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