Changes in [18F]-FDG uptake during MPXV infection of NHPs in LNs at different locations. (A) [18F]-FDG uptake in the right- and left-side axillary LNs in one moribund NHP (UNTR-1) and one survivor (UNTR-2). (B) [18F]-FDG uptake in the axillary and inguinal LNs on select days in one moribund NHP (UNTR-1) and one survivor (UNTR-2). Abbreviations: [18F]-FDG, [18F]-fluorodeoxyglucose; LN, lymph node; MPXV, monkeypox virus; mSUVthr, modified SUVthreshold; NHP, nonhuman primate; UNTR, untreated.