Jennifer Lee, MD is a CNN medical analyst and a clinical associate professor of emergency medicine at The George Washington University. Follow her @DrJenLee. Opinions expressed in this commentary are her own. View more opinion on CNN. (CNN)Should everyone be wearing masks?The Centers for Disease Control and Prevention says no. China, South Korea, Taiwan, Hong Kong and the Czech Republic say yes. In some parts of China, it is mandatory to wear a mask when in public. Those caught outside not wearing a mask are stopped by police and may be fined or even arrested. In South Korea, Taiwan and Hong Kong, health authorities advise everyone to wear a mask in the presence of others, especially in crowded places (i.e., riding the subway).However, here in the United States, the CDC guidance continues to be, “If you are NOT sick: you do not need to wear a face mask unless you are caring for someone who is sick (and they are not able to wear a face mask).” The CDC goes on to say that “face masks may be in short supply and they should be saved for caregivers.” In line with this guidance, the US surgeon general tweeted in February,

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