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letter . 2021 Aug 22:ciab727. doi: 10.1093/cid/ciab727
Undetected and relatively sustained SARS-CoV-2 circulation worldwide during the year 2019
Stefano Petti
1,✉
Stefano Petti
1Department of Public Health and Infectious Diseases, Sapienza University of Rome, Italy
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1Department of Public Health and Infectious Diseases, Sapienza University of Rome, Italy
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Correspondence: Stefano Petti, Department of Public Health and Infectious Diseases, Sapienza University, Piazzale Aldo Moro 5, I-00185, Rome, Italy (stefano.petti@uniroma1.it)
Received 2021 Jul 18.
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PMCID: PMC8499797 PMID: 34420046