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