A key question from the start of the COVID-19 pandemic has been whether individuals can become reinfected with SARS-CoV-2, and if so, the frequency of occurrence and timing relative to prior infection.
There are numerous studies that demonstrate prolonged detection of SARS-CoV-2 RNA that extends beyond the resolution of COVID-19 symptoms and can persist for several weeks or months.
For more information on this topic visit the Government of Canada's Guidance for repeated PCR testing in individuals previously positive for COVID-19