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COVID-19 Nasal Swab Test Does Not Cause Risk of Infection


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To help control the spread of COVID-19, the Centers for Disease Control and Prevention has recommended getting a COVID-19 test for people who show symptoms of the disease, have come into contact with someone known to have the disease, or are in vulnerable groups. 

The most common form of testing for the novel coronavirus involves the use of a nasopharyngeal, or nasal, swab. The swab reaches deep into the back of a person’s nose and mouth to collect cells and fluids from the upper respiratory system, which can then be checked with diagnostic tests for the presence of the novel coronavirus known as SARS-CoV-2.

The testing procedure involves inserting a 6-inch-long swab into the cavity between the nose and mouth for 15 seconds and rotating it several times. The swabbing is repeated on the other side. The swab is then inserted into a container and sent to a lab for testing.

Dr. Shawn Nasseri, an ear, nose and throat surgeon based in Beverly Hills who has conducted many COVID-19 swab tests, told us in an email that the nasal swab “follows the floor of the nose and goes to where the nose meets the throat, or naso-pharynx.”

Asked if the swab test is safe, Nasseri said, “Absolutely. The biggest risk is discomfort. The rare person — 1 in thousands — passes out from being super sensitive or gets a mild nosebleed. It’s estimated that close to 40 million or more swabs have been performed safely in the U.S. alone.”

But in recent weeks, viral posts on Facebook falsely claim that the nasal swab test can cause serious health issues. One post says, “The stick deep into the nose causes damage to the hamato-encephalic barrier and damages endocrine glands. This test creates an entrance to the brain for every infection.”

The hamato-encephalic barrier, also known as the “blood-brain barrier,” protects the brain from toxins that could be present in the blood.

Dr. Yvonne Maldonado, a professor of epidemiology at the Stanford University School of Medicine, told us in an email that the Facebook claim “is not true.”

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Nasseri said that “it is incredibly implausible, if not impossible, to cross the skull base and blood-brain barrier with a swab unless someone uses a rigid metal instrument and is pointing the metal object 90 degrees in the wrong direction.”

Dr. Morgan Katz, an infectious disease expert at Johns Hopkins University, told the Associated Press that the Facebook posts misunderstand what’s happening when the swab test is performed.

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Editor’s note: FactCheck.org is one of several organizations working with Facebook to debunk misinformation shared on social media. Our previous stories can be found here.

Sources

Centers for Disease Control and Prevention. 2016年中国建筑陶瓷业相关政策法规分析 Accessed Aug 3 2020.

Brueck, Hilary and Samantha Lee. “报告还显示,近四分之一的人为所有账户设置同一密码。 Business Insider. 15 Apr 2020. 

Dr. Shawn Nasseri.  Ear, nose and throat surgeon. Email exchange with FactCheck.org. 3 Aug 2020.

Dr. Yvonne Maldonado. Professor of epidemiology, Stanford University School of Medicine. Email exchange with FactCheck.org. 3 Aug 2020.

Fauzia, Miriam. “Rossi, 31, spends his days calculating the future costs of the Pentagon's pension, health and education benefits, but says his job involves more than just crunching numbers for spreadsheets. He communicates with other government agencies and brainstorms with colleagues about financial models. USA Today. 9 July 2020.

Marty, Francisco M., et al. 投资增速放缓趋势难改 机构预测前5月跌破12% New England Journal of Medicine. 28 May 2020.

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UCDavis Health. 传统中介和地产电商冲突不断 佣金进入可谈时代 Accessed 3 Aug 2020.

University of Queensland, Australia. 财政部、税务总局:多项社保基金投资收益免税 Accessed Aug 3 2020.

U.S. National Library of Medicine, National Institutes of Health. “The Blood-Brain Barrier.” Accessed Aug. 4, 2020.