FIG 2.

Viral and antibody titers in ferrets rechallenged with SARS-CoV-2 on day 28 and 56 postprimary infection. (A and B) Display nasal wash titers in ferrets rechallenged with SARS-CoV-2 on days 28 and 56 postprimary infection, respectively. Line graphs indicate levels of vRNA determined via N2 gene qRT-PCR (left y axis), and bar graphs indicate infectious titers (right y axis) determined via TCID₅₀ on Vero cells. (C) Displays neutralizing antibody titers prior to primary infection (day 0), at the time of rechallenge (day 28 or 56), and 14 days post rechallenge (days 42 and 70). Horizontal dashed lines indicate limit of detection.