特朗普終於改口：「我完全支持戴口罩」. BBC News 中文. 2020-07-02 [2020-07-03]. （原始内容存档于2020-07-03） （中文（繁體））.
cdc.gov
Interim Recommendations for Facemask and Respirator Use to Reduce Novel Influenza A (H1N1) Virus Transmission （页面存档备份，存于互联网档案馆）, Centers for Disease Control and Prevention, May 27, 2009: "Unless otherwise specified, the term "facemasks" refers to disposable facemasks cleared by the U.S. Food and Drug Administration (FDA) for use as medical devices. This includes facemasks labeled as surgical, dental, medical procedure, isolation, or laser masks... Facemasks should be used once and then thrown away in the trash."
Interim Recommendations for Facemask and Respirator Use to Reduce Novel Influenza A (H1N1) Virus Transmission （页面存档备份，存于互联网档案馆）, Centers for Disease Control and Prevention, May 27, 2009: "Unless otherwise specified, the term "facemasks" refers to disposable facemasks cleared by the U.S. Food and Drug Administration (FDA) for use as medical devices. This includes facemasks labeled as surgical, dental, medical procedure, isolation, or laser masks... Facemasks should be used once and then thrown away in the trash."
