feb 26, 1978 - Smallpox
Description:
There was a lab accident in 1978 where a strain of smallpox that had been grown spread through the ducting of the University Of Birmingham medical school. The outbreak resulted in the death of Janet Parker, the last recorded person to die from smallpox.
(from https://en.wikipedia.org/wiki/1978_smallpox_outbreak_in_the_United_Kingdom)
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