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Avoid crowds, wear a mask and isolate: how Japan's coronavirus response echoes Spanish flu guidelines | South China Morning Post
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Who Should Wear a Mask During Flu Season? - The New York Times
Men And Women Wearing Medical Face Masks To Prevent Disease Flu Air Pollution World Pollution Stock Illustration - Download Image Now - iStock
Diverse Businesspeople Wearing Protective Medical Face Masks During Flu Season Stock Photo - Download Image Now - iStock
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Wearing a face mask may not help prevent the flu
Face masks recommended to help prevent flu transmission | News | Harvard T.H. Chan School of Public Health
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Study: Face masks seem to protect against flu - CNN.com
