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Here are a few tips to protect yourself from a cough with phlegm.
References:
https://www.cdc.gov/flu/protect/covercough.htm
https://www.health24.com/Medical/Cough/Overview/how-to-prevent-coughing-20180220
https://www.healthline.com/health/cold-flu/how-to-get-rid-of-phlegm#see-a-doctor
https://www.healthline.com/health/how-to-get-rid-of-mucus-in-chest
http://www.mydr.com.au/respiratory-health/cough-productive-or-wet-cough-treatments