Research accidents have occurred, too, in the history of dangerous new viruses, and longtime concerns over such accidents constitute the priors of some who favor the lab-leak hypothesis for Covid.

Source: https://www.nytimes.com/2023/07/25/magazine/covid-start.html

While some scientists are open to the lab-leak theory, others continue to believe the virus came from animals, mutated, and jumped into people—as has happened in the past with viruses.

Source: https://businessmirror.com.ph/2023/03/01/covid-origins-a-mystery-3-years-into-pandemic/