[WithinReason]

An important question. For the sake of adjusting priors here is a list of biosecurity incidents:

https://en.wikipedia.org/wiki/List_of_laboratory_biosecurity...

SARS itself leaked from the lab 4 times, once from a BSL-4 lab.

[ethbr0]

* SARS*, including the original SARS virus (3 times, per page) and SARS-CoV-2 (1 time, post-pandemic)

[WithinReason]

Actually I meant SARS-CoV-1 leaked 4 times, one of the events listed was actually 2 separate ones 2 weeks apart if you read the description.