Singing happy birthday may be good for timing how long to wash your hands, but a new study reveals it could also be spreading coronavirus infected droplets.
Aerosol researchers at Lund University, Sweden studied the amount of particles emitted when we sing, and the impact this has on the spread of Covid-19.
To understand how many virus particles are emitted when we sing, researchers had 12 healthy singers and two people with Covid-19 sing into a funnel.
The study shows that singing – particularly loud and consonant-rich singing found in songs like Happy Birthday – spreads a lot droplets into the surrounding air.
Researchers say if singers wear a face mask and venues practice social distancing and implement good ventilation, then the risk from singing can be reduced.
The NHS recommended people sing 'Happy Birthday' twice while washing hands as it was the perfect amount of time to ensure as many germs as possible are removed.
The idea for the study came off the back of a number of reports about the spread of Covid-19 in connection with choirs singing together, researchers explained.
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