Reports of mpox cases continue in the United States, reflecting ongoing community transmission nationally and internationally. Between January–August, 2023, 30 mpox cases were reported in King County, averaging four new cases each month. The majority of cases did not report travel prior to symptom onset, suggesting local transmission. Since the beginning of September 2023, there have been 11 new cases, including a cluster of three cases reporting attending sex parties during their exposure period. Notably, six of the 11 cases had been vaccinated with a 2-dose series of JYNNEOS; most had been vaccinated approximately one year prior while one case received their dose 2–3 months prior to infection. None were hospitalized. Recent cases have been predominantly among men, ages 18–49 years, particularly among men who have sex with men. Local epidemiology data is updated monthly on the King County mpox online dashboard.
In the 2022 global outbreak of mpox, cases spread rapidly across much of the world through person-to-person contact, disproportionately affecting gay and bisexual men, other men who have sex with men (MSM), and transgender people. However, anyone who has close, personal, skin-to-skin contact with an infected person is at risk of developing mpox. The risk of spread is considered low through touching contaminated objects, fabrics, and surfaces, even without disinfection. This includes items like clothing, bedding, towels, fetish gear, or sex toys. Most patients with mpox have mild disease, although some, particularly those with advanced or untreated HIV infection, may experience more severe outcomes.