Well this is terrifying. ACAM2000 is one of two smallpox vaccines approved for emergency use (EUA) in treatment of Monkeypox (MPX) in Australia. It can cause death to people who come into contact with vaccinees. See the below from page 6 of the ACAM2000 product info sheet:
JYNNEOS is safer than ACAM afaik
Live UN-attenuated
Most dangerous