Associations of Vaccination and of Prior Infection With Positive PCR Test Results for SARS-CoV-2 in Airline Passengers Arriving in Qatar

Research letter describing 261,849 residents of Qatar who were tested using PCR for SARS-CoV-2 upon arrival at airport found vaccination and prior infection were linked to reduced risk for SARS-CoV-2 PCR test positivity (RR 0.22;95% CI, 0.17-0.28 and 0.26; 0.21-0.34;respectively)

Source:

Journal of the American Medical Association