Late last year, a semi-retired British scientist co-authored a petition to Europe¡¯s medicines regulator. The petitioners made a bold demand: Halt COVID-19 vaccine clinical trials.

Even bolder was their argument for doing so: They speculated, without providing evidence, that the vaccines could cause infertility in women.

The document appeared on a German website on Dec.1. Scientists denounced the theory. Regulators weren¡¯t swayed, either: Weeks later, the European Medicines Agency approved the European Union¡¯s first COVID-19 shot, co-developed by Pfizer Inc. But damage was already done.