Check it out. I believe that one case in England - Midlands - Birmingham was 1977. She died.
Edit…September 1978. Suspected that they were working on pox pathogens in the building and it may have escaped through ducting (ironically how penicillin came to be discovered).
The woman’s parents both contracted it. Mother recovered but father died of a heart attack without a post mortem being conducted because of fears it could possibly allow smallpox to spread.
The head of the microbiology lab killed himself while in quarantine, saying he’d put everyone at risk.