Is It Gross to Blow out Birthday Candles?

From SciShow.

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A certain viral video may have brought it to your attention that blowing out candles on a birthday cake might be gross, but exactly how gross depends on who’s blowing the candles out.

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Sources:
http://www.ccsenet.org/journal/index.php/jfr/article/view/67217
https://people.com/politics/mitt-romney-blows-out-birthday-candles-reaction/
https://www.theatlantic.com/health/archive/2017/07/birthday-candle-bacteria/534987/
https://dhss.delaware.gov/dph/files/airbornetranspi.pdf
https://www.today.com/food/birthday-cake-candles-danger-spreading-bacteria-t116130
https://jb.asm.org/content/192/19/5002