Bertollini R, Chemaitelly H, Yassine HM, Al-Thani MH, et al. Associations of Vaccination and of Prior Infection With Positive PCR Test Results for SARS-CoV-2 in Airline Passengers Arriving in Qatar. JAMA 2021 Jun 9. pii: 2781112. doi: 10.1001/jama.2021.9970.
PMID: 34106201