Site Details LOCATION 8 Blackwood Avenue, Parktown Johannesburg, 2193 27 11 276-8800 Get Directions SiteType CTU Site Trials COVID-19 and Mpox Closed to accrual A5418: Study of Tecovirimat for Human Mpox Virus A5418 (STOMP) is a study of tecovirimat (also known as TPOXX) for the treatment of human monkeypox virus (HMPXV) disease.