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MLA Citation
Dustin R Long et al.. “Occurrence and Timing of Subsequent Severe Acute Respiratory Syndrome Coronavirus 2 Reverse-transcription Polymerase Chain Reaction Positivity Among Initially Negative Patients.” Clinical infectious diseases, vol. 72, 2021, pp. 323–326. http://access.bl.uk/ark:/81055/vdc_100121927207.0x000043