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There is a complete absence of evidence as to whether they actually reduce the incidence of these infections. Pixabay

There is an important absence of evidence regarding the effectiveness of a potentially cost-efficient intervention, like air filters, to prevent indoor transmission of respiratory infections, including Covid-19, warns a study.

Controlling how we acquire and transmit respiratory infections is of huge importance, particularly within indoor environments such as care homes, households, schools/daycare, office buildings, and hospitals where people are in close contact.


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“Whilst we found some evidence suggesting the use of air filters could theoretically contribute to reducing the spread of Covid-19 and other respiratory infections by capturing airborne particles, there is a complete absence of evidence as to whether they actually reduce the incidence of these infections,” said lead author Ashley Hammond, an Infectious Disease Epidemiologist at the Centre for Academic Primary Care, University of Bristol, in the paper published in the journal PLoS One.


They also explored whether portable air filters in indoor settings capture airborne bacteria and viruses within them, and if so, what specifically is captured. Pixabay

Several manufacturers of portable air filters have claimed their products remove potentially harmful bacteria and viruses from indoor air, including Covid-19 viral particles. However, there is often no detailed evidence provided on their websites to corroborate their claims for potential consumers to review before purchasing.

ALSO READ: Home Care Tips For Managing COVID19

A team of researchers from the Bristol University reviewed previous studies to investigate whether portable air filters used in any indoor setting can reduce the incidence of respiratory infections. They also explored whether portable air filters in indoor settings capture airborne bacteria and viruses within them, and if so, what specifically is captured.

Two studies reported the removal or capture of airborne bacteria in indoor settings (an office and emergency room), demonstrating that the filters did capture airborne bacteria and reduced the number of airborne bacteria in the air. Neither tested for the presence of viruses in the filters, nor a reduction in viral particles in the air. (IANS/JC)


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Tokyo Olympics 2020 Indian wrestler Ravi Kumar enter semi finals.

Indian wrestler Ravi Kumar (57kg) and Deepak Punia (86kg) enjoyed fruitful outings at the Tokyo Olympic Games as they secured semifinal berths in their respective weight categories at the Makuhari Messe on Wednesday.

On the opening day of the wrestling competition, Ravi Kumar defeated Bulgaria's Georgi Vangelov 14-4 on technical superiority to reach the last-four in the men's 57kg category, while compatriot Deepak Punia overcame China's Zushen Lin 6-3 on points to advance to the semifinals.

Ravi Kumar will take on Nurislam Sanayev of Kazakhstan in the last-four, while Punia will be up against David Morris Taylor of the USA.

Earlier, Ravi Kumar had won his opening-round bout by technical superiority against Colombia's Oscar Tigreros to secure a quarterfinal spot. Competing in the Round-of-16 bout against the Colombian wrestler, the 23-year-old Ravi Kumar, who is making his Olympic debut, showed no nerves as he dominated the bout to win by technical superiority (13-2).

Ravi Kumar landed attack after attack and went 13-2 up, winning the bout by technical superiority with minutes to spare. In wrestling, building up a 10-point lead over the opponent results in a victory by technical superiority.

India's 86kg freestyle wrestler Deepak Punia showed no signs of the niggle that had forced him to pull out of the Poland Open Ranking Series in Warsaw in June, as he defeated Nigeria's Ekerekeme Agiomor on technical superiority to secure a quarterfinal berth.

He got his Olympic campaign to a fine start as he was in control from the start of the bout and hardly ever allowed his Nigerian opponent any room to maneuver his moves, finally winning with a 12-1 on technical superiority.

Punia, who had also suffered an elbow injury just before the Games, was slow at the start but came into his own as the bout progressed, inflicting takedowns at regular intervals to earn points.

The Indian wrestler eased into a 4-1 lead at the break and extended his lead comfortably in the second period.

Punia, the silver medallist from the 2019 world wrestling championships, then set up a clash with China's Lin Zushen in the quarterfinals and defeated him 6-3.

(IANS/HP)