Leaders against Tipu Jayanti had lauded him earlier: Laxmi Hebbalkar

Bengaluru,  Apr 30: As many as 30 new COVID-19 cases have been confirmed in Karnataka from April 29, 5:00 pm to April 30, 5:00 pm, taking the total number of cases to 565, informed the State Health Department on Thursday.

Meanwhile, a total of 1,718 new cases were reported in the last 24 hours, taking the total number of cases to 33,050 in the country.

A total of 630 patients have recovered in the last 24 hours, as per the latest data provided by the Union Ministry of Health and Family Welfare.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, Mar 24: A Covid-19 patient from Kasaragod, who recently came from abroad travelled to Mangaluru twice, revealed Karnataka department of health and family welfare.

The 54-year-old person is confirmed as Covid-19 positive case yesterday.

He landed at Mangalore International Airport on March 10 at 5.30pm by Air India Express flight.

From there, he had travelled in his own vehicle to Kasaragod. He had coffee near Kasaragod and reached home at 7.30pm.

On March 11, he had visited local fish market and returned home at 10pm.

He had consulted a local doctor at Kasaragod on March 18 and later visited to Kasturba Medical College, Attavar at 3pm, visited reception and consulted a doctor.

He had tea at KMC canteen and travelled in an auto to Medicity and brought medicines and returned to Kasaragod by KSRTC bus.

Again he travelled to Mangaluru on March 20 in a private vehicle and visited a doctor and returned back to Kasargod in a private vehicle.

The health department has requested all passengers who travelled in the above said flight/aircraft, and KSRTC bus can self-report by dialing 104 or other helpline numbers.