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Comparative accuracy of oropharyngeal and nasopharyngeal swabs for diagnosis of COVID-19 - The Centre for Evidence-Based Medicine
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Meaning of swab (swabs, swabbed, swabbing, swabs) in English-Chinese (T) dictionary - World of Dictionary
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China expands anal swab coronavirus tests, saying it's more accurate than throat method - The Washington Post
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Covid test: No more nasal swabs: Scientists develop new low-cost Covid test that will use saliva only - The Economic Times
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