We prospectively assessed asymptomatic monkeypox virus infections among men who have sex with men in Tokyo, Japan, during the initial phase of the mpox epidemic. Our findings suggest that asymptomatic infections were likely underestimated and were comparable in magnitude to symptomatic infections, highlighting the need to improve testing accessibility among high-risk populations.
Keywords: Japan; MSM; Mpox; asymptomatic; men who have sex with men; monkeypox virus; sexually transmitted infections; viruses.