Watching someone blow birthday candles during a coronavirus pandemic can cause concern that aerosols are spewing into the air. But you may worry about the tradition coming shortly before the candles are extinguished, because the song “Happy Birthday” may also make us think of a possible broadcast of COVID-19 for Swedish studies.
“Singing generated more respiratory aerosol particles and droplets than respiration,” researchers at the Aerosol Laboratory at Lund University said in their published study in the journal Aerosol Science and Technology.
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Researchers also found that the consonants are guilty of carrying aerosols during a tune, according to the study, and many of the consonants they identified were discovered in the song “Happy Birthday”.
“By analyzing the droplet of the high-speed camera, we found that some consonants, for example, ‘P’, ‘B’, ‘R’, and ‘T’, produced a large number of small to large drops. , “The researchers said in the published study.
In particular, Malin Alseved, a doctoral student of aerosol technology at Lundra, said in a study, “In particular, the accumulation of consonants leads to very large drops and the letters B and P emerge as the largest aerosol circulators.”
In the study, participants entered a chamber filled with filtered air free of particles. The researchers analyzed a high-speed camera, strong lamps, and an instrument to measure small particles produced by artists, as they wore, wearing, face masks, singing, talking and then singing, according to a press release Were.
The release explained that participants sang a Swedish song, “Bibbis Puppi Petter”, repeatedly for two minutes and then sang the song again without consonant, leaving only the vocals. The team of researchers then measured the presence of aerosols, the mass of the droplets, and the distances traveled by air particles.
“Vocal singing does not provide high airflow for the dispersion of particles, but as shown in the video file, the consonance of the consonant ejects the drops with considerable forward velocity. The published study states that most The largest drops travel a limited distance (<0.5 m) before their movement becomes vertical due to sedimentation. "Some drops are so large that they only take a few decimeters from the mouth before falling, while others are small and can last for a few minutes," the study release said. Researchers also detected singing in novel coronavirus-infected patients. “We also measured the virus in the air close to two people when they sang COVID-19. There was no detectable amount of virus in their air samples, but the viral load may vary between different parts of the airway and between different people. Accordingly, the aerosol of a person with Kovid-19 may still be at risk of infection while singing, ”Alsewed said in a press release. When singing "Happy Birthday", be careful with the loudness you sing and the pitch you sing to the tunes, in an effort to avoid broadcasters. "Aerosol particles and droplets increase with the intensity of the song," the researchers said in the published article. The report also noted that higher pitches emitted more particles. The study also stated that wearing a face-cover may help prevent the spread of aerosols. Experimental studies, how class in the curriculum of coronary courses, Indian region
The study also addressed the importance of face masks to prevent the transmission of drops and viruses.
“When the singer was wearing a simple face mask it caught most of the aerosols and drops and the levels were comparable to simple speech,” released study author Jacob Londahl, an associate professor of aerosol technology at Lund University.
Whether singing “Happy Birthday” at home or in group activity, the authors concluded that singing in groups increases the risk of transmission of the virus, but is said to be at risk from wearing face masks, social distancing, use of proper ventilation Can be reduced. hand hygiene.