Figure 4.

Comparison of Ct values between the first and subsequent (≥45 d) positive SARS-CoV-2 NAAT by final subject categorization. The lowest Ct value by final categorization for each subject is depicted. Of note, 12/65 (18%) subjects had a positive NAAT with a Ct value <35 at least 90 d after their initial positive test. Subject P4 had a day 90 NAAT with a Ct value of 32.81 but is represented in the 45–89 d group, because their lowest Ct value of 23.09 occurred on day 79. Subject I43 was excluded due to an unavailable Ct value for their day 237 positive NAAT. Abbreviations: Ct, cycle threshold; NAAT, nucleic acid amplification test; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.