Of course, a face mask or a scarf would also do.
Link: https://www.cnn.com/2022/12/06/health/why-winter-colds-flu-wellness/index.html
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in a recent UCSF Grand Rounds video I posted, a Virologist/Epidemiologist noted that there is some history to one virus periodically cancelling out another in a back-and-forth pattern...studies are ongoing.
Link: https://www.scientificamerican.com/article/flu-has-disappeared-worldwide-during-the-covid-pandemic1/