A top Pfizer executive’s admission Monday to European lawmakers that the pharmaceutical giant never tested its COVID vaccine to determine if it stopped transmission is raising new questions about the global effort to compel people to get the jabs.

Janine Small, Pfizer’s president of international developed markets, made the stunning admission while testifying before the European Union Parliament. She was asked by European Union Member of Parliament Rob Roos if the company tested its mRNA vaccine on stopping transmission before rolling it out.