This information slipped over 2 years ago (probably right at the beginning). Wiesendanger did a study and referenced that a lab worker was suspected as patient

This information slipped over 2 years ago (probably right at the beginning). Wiesendanger did a study and referenced that a lab worker was suspected as patient zero¹ as a hint. ¹:https://www.uni-hamburg.de/newsroom/presse/2021/pm8.html https://www.uni-hamburg.de/newsroom/presse/2021/pm8.html (German, sorry)