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. 2022 Apr 7;17(4):e0266691. doi: 10.1371/journal.pone.0266691

Fig 1. Participant flow: Times of FluoroSpot assays relative to the first positive PCR test.

Fig 1

Participants were enrolled in the initial prospective study and tested by qPCR biweekly initially and then bimonthly. When qPCR positive, the participant was transferred to the immune response subgroup within 48–96 hours (7d*) and tested by qPCR biweekly and bimonthly thereafter. PBMCs were isolated (red arrows) prior to the initial qPCR (at enrollment, T0), and once positive at ¾ days 7 days (grouped into T7), 10/11 days (grouped into T14), and greater than 28 days (time long-term (grouped into TLT) post qPCR positivity for SARS-CoV-2.