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. 2023 Sep 7;14:1243523. doi: 10.3389/fmicb.2023.1243523

Figure 3.

Figure 3

Limits of detection with infectious virus. α-A29 is used as the capture MAb, with S27 or 4B4 as the 2° MAb. S27-PE, S27-B, and 4B4-B are depicted as black circles, blue squares, and red triangles, respectively. Median fluorescence intensity (MFI) is shown as a function of virus titer in pfu/mL for MPXV strains Zaire '79 (A), Katakombe (B), US 2003 (C), and the currently circulating strain (D). Data were fit with a 4-parameter sigmoidal function. Interpolated limits of detection of the antigen assays are shown with 90% confidence intervals in (E). The 4B4 assay does not detect Clade II MPXV and is excluded from (C, D).