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The test is typically done on respiratory samples obtained by a nasopharyngeal swab; however, a nasal swab or sputum sample may also be used. [179] [180] Results are generally available within hours. [20] The WHO has published several testing protocols for the disease. [181]
The standard method of testing for presence of SARS-CoV-2 is a nucleic acid test, [115] which detects the presence of viral RNA fragments. [116] As these tests detect RNA but not infectious virus, its "ability to determine duration of infectivity of patients is limited". [ 117 ]