{"id":37763,"date":"2021-02-11T09:46:47","date_gmt":"2021-02-11T16:46:47","guid":{"rendered":"https:\/\/www.uchealth.org\/today\/?p=37763"},"modified":"2024-12-24T08:53:56","modified_gmt":"2024-12-24T15:53:56","slug":"should-you-wear-a-double-mask","status":"publish","type":"post","link":"https:\/\/www.uchealth.org\/today\/should-you-wear-a-double-mask\/","title":{"rendered":"Should you wear a double mask?"},"content":{"rendered":"
<\/div>

Mind the gaps.<\/p>\n

That\u2019s the conclusion of a U.S. Centers for Disease Control and Prevention study<\/a> released Feb. 10. Considering the exponential spread of much more transmissible viral variants<\/a>, it\u2019s one we should act on.<\/p>\n

The study found that it\u2019s not just about the mask. It\u2019s about the fit of the mask, and a good fit can make a huge difference in how well masks cut down on and protect from infectious aerosols and slow the transmission of COVID-19.<\/p>\n

While there are many ways to improve fit \u2013 from mask fitters<\/a> to pantyhose-type elastic sleeves<\/a> \u2013 the CDC research team focused on two options.<\/p>\n

The first was double masking: that is, wearing a three-ply cotton-cloth mask over a surgical mask (also called a medical-procedure mask). (The team did not test double-masking with two cloth masks.)<\/p>\n

The second was knotting and tucking the surgical mask to change its fit and close the gaps. This short video<\/a> shows how that\u2019s done.<\/p>\n

\"young
A young woman demonstrates wearing a double mask. Photo: UCHealth.<\/figcaption><\/figure>\n

The CDC study: Wearing a double mask<\/strong><\/h2>\n

The CDC study happened in a lab. The key experimental tools included two rubber versions of human heads, a 10-foot by 10-foot by seven-foot sealable chamber, and a sort of humidifier that emitted potassium chloride particles of the sizes considered most complicit in the aerosol spread of the coronavirus (0.1 to 0.7 microns across). Those aerosols were pushed through the mouth of one of the rubber heads for 15 minutes at a time over several runs.<\/p>\n

The team tested 10 scenarios, some with the aerosol-emitting rubber head unmasked, some with the receiving head unmasked, and some with both heads masked in different ways. They tested simulated coughs; they tested simulated breathing. Key findings:<\/p>\n

    \n
  1. The unknotted surgical mask alone blocked 42% of the particles from a simulated cough; the cloth mask alone blocked 44% of those particles.<\/li>\n
  2. A cloth mask over a surgical mask (a double mask) blocked 92% of coughed particles.<\/li>\n
  3. Double-masking the emitter cut the exposure of an unmasked receiver by 82%; knotting and tucking the emitter\u2019s surgical mask reduced it by 63%.<\/li>\n
  4. Leaving the emitter unmasked but double-masking the receiver cut the receiver\u2019s exposure by 83%; when the receiver wore a knotted-and-tucked surgical mask alone, aerosol exposure fell by 64%.<\/li>\n
  5. When both emitter and receiver were double-masked, aerosol exposure fell by about 96%; the same held for when emitter and receiver both wore knotted and tucked surgical masks.<\/li>\n<\/ol>\n

    Points 1 and 5 point to the conclusion that the material of the mask \u2013 three-ply cotton or three-ply surgical \u2013 is a lot less important than making sure whatever mask one wears fits right.<\/p>\n

    \u201cFit matters. Wear a mask that covers your mouth and nose and doesn\u2019t have big, gaping holes at the sides,\u201d said Dr. Michelle Barron<\/a>, UCHealth\u2019s top infectious-disease specialist.<\/p>\n

    Barron says that, while the CDC\u2019s scientific approach looks solid, the perceived recommendation of double-masking \u2013 one emphasized by breaking stories in the Washington Post, the New York Times<\/a>, Fox News<\/a>, CNN<\/a>, and others \u2013 could lead to confusion and, potentially, unwarranted concern among the public.<\/p>\n

    \"Masks
    Masks the CDC researchers tested, including A, unknotted medical procedure mask; B, double mask (cloth mask covering medical procedure mask); and C, knotted\/tucked medical procedure mask. Photo courtesy of CDC.<\/figcaption><\/figure>\n

    First things first: Wear a mask correctly, physical distance, wash hands<\/strong><\/h2>\n

    These were laboratory conditions, not real-world scenarios, she noted. In the real world, we\u2019re taking \u2013 or should be taking \u2013 many steps to reduce risk: avoiding close contacts among those outside our immediate circle, skirting crowds and enclosed spaces, washing hands, and, yes, masking up. Barron likened this portfolio of preventative steps to the one that helps us avoid getting hurt in car accidents.<\/p>\n

    \u201cYou drive the speed limit, you wear a seat belt, and the car has airbags,\u201d Barron said. \u201cOne of those alone is unlikely to be the only thing that works. That\u2019s why there are multiple safety features in place.\u201d<\/p>\n

    Further, it has been hard enough to get people to wear a single mask properly, much less to double up, she said.<\/p>\n

    \u201cThe risk is that people will worry about spreading the coronavirus because they\u2019ve only been wearing one mask,\u201d Barron said. \u201cThat\u2019s not the issue. The issue isn\u2019t that people aren\u2019t wearing two masks \u2013 it\u2019s that they aren\u2019t wearing a mask at all, or wearing it under their nose or under their chin at a Super Bowl party with 20 other people.\u201d<\/p>\n

    \"Headshot
    Dr. Michelle Barron says fit matters when wearing a mask. Photo by Cyrus McCrimmon for UCHealth.<\/figcaption><\/figure>\n

    The CDC study\u2019s highlighting the importance of proper mask fit is more important than its focus on double-masking and knotting and tucking, Barron said. Even cookie-cutter surgical masks fit different people differently, and whether it\u2019s a cloth mask or a surgical mask, finding the right fit is important.<\/p>\n

    \u201cMasks are like shoes \u2013 one shoe isn\u2019t going to fit everybody,\u201d she said.<\/p>\n

    If doubling up or knotting and tucking works for you, go for it, Barron said. But ultimately, we might be better served to focus on properly wearing one good mask that actually fits.<\/p>\n

     <\/p>\n","protected":false},"excerpt":{"rendered":"

    Mind the gaps. That\u2019s the conclusion of a U.S. Centers for Disease Control and Prevention study released Feb. 10. Considering the exponential spread of much more transmissible viral variants, it\u2019s one we should act on. The study found that it\u2019s not just about the mask. It\u2019s about the fit of the mask, and a good […]<\/p>\n","protected":false},"author":23,"featured_media":37965,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"categories":[8],"tags":[4860,330,392],"class_list":["post-37763","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-covid-19","tag-infection-control","tag-infection-prevention"],"acf":[],"yoast_head":"\nShould you wear a double mask? - UCHealth Today<\/title>\n<meta name=\"description\" content=\"Wearing a double mask, knotting and tucking surgical masks may reduce aerosols more, but wearing one mask correctly is half the battle.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.uchealth.org\/today\/should-you-wear-a-double-mask\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Should you wear a double mask?\" \/>\n<meta property=\"og:description\" content=\"Wearing a double mask, knotting and tucking surgical masks may reduce aerosols more, but wearing one mask correctly is half the battle.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.uchealth.org\/today\/should-you-wear-a-double-mask\/\" \/>\n<meta property=\"og:site_name\" content=\"UCHealth Today\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/uchealthorg\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-02-11T16:46:47+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-12-24T15:53:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/uchealth-wp-uploads.s3.amazonaws.com\/wp-content\/uploads\/sites\/6\/2021\/02\/19090426\/mask.jpgtiny1.jpg\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Todd Neff, for UCHealth\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@uchealth\" \/>\n<meta name=\"twitter:site\" content=\"@uchealth\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Todd Neff, for UCHealth\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.uchealth.org\\\/today\\\/should-you-wear-a-double-mask\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.uchealth.org\\\/today\\\/should-you-wear-a-double-mask\\\/\"},\"author\":{\"name\":\"Todd Neff, for UCHealth\",\"@id\":\"https:\\\/\\\/www.uchealth.org\\\/today\\\/#\\\/schema\\\/person\\\/da7733ff5562e48e55c027d111ee5911\"},\"headline\":\"Should you wear a double mask?\",\"datePublished\":\"2021-02-11T16:46:47+00:00\",\"dateModified\":\"2024-12-24T15:53:56+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.uchealth.org\\\/today\\\/should-you-wear-a-double-mask\\\/\"},\"wordCount\":880,\"publisher\":{\"@id\":\"https:\\\/\\\/www.uchealth.org\\\/today\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.uchealth.org\\\/today\\\/should-you-wear-a-double-mask\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/uchealth-wp-uploads.s3.amazonaws.com\\\/wp-content\\\/uploads\\\/sites\\\/6\\\/2021\\\/02\\\/19090426\\\/mask.jpgtiny1.webp\",\"keywords\":[\"COVID-19\",\"Infection control\",\"Infection prevention\"],\"articleSection\":[\"News\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.uchealth.org\\\/today\\\/should-you-wear-a-double-mask\\\/\",\"url\":\"https:\\\/\\\/www.uchealth.org\\\/today\\\/should-you-wear-a-double-mask\\\/\",\"name\":\"Should you wear a double mask? 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