1. Laboratory testing for coronavirus disease 2019 (COVID-19) in suspected human cases: interim guidance, World Health Organization (No. WHO/COVID-19/laboratory/2020.4), Mar. 2020.
2. Comparison of nasopharyngeal and oropharyngeal swabs for SARS-CoV-2 detection in 353 patients received tests with both specimens simultaneously
3. Evaluating the accuracy of different respiratory specimens in the laboratory diagnosis and monitoring the viral shedding of 2019-nCoV infections
4. K. Carver and N. Jones, “Comparative accuracy of oropharyngeal and nasopharyngeal swabs for diagnosis of COVID-19,” Centre for evidence-based Medicine (CEBM), Nuffield Department of Primary Care Health Sciences, University of Oxford, Mar. 2020. [Online]. Available: https://www.cebm.net/covid-19/comparative-accuracy-oforopharyngeal-and-nasopharyngeal-swabs-for-diagnosis-of-covid-19/. [Accessed: 24-May-2020].
5. Interim Guidelines for Collecting, Handling, and Testing Clinical Specimens for COVID-19, Centers for Disease Control and Prevention, Department of Health and Human Services, United States, May 2020.