I don't think that there is necessarily a connection between rumors people might hear about the possible dangers of a vaccine and the actual dangers, if any, the vaccine might pose.
Rumors can range from accurate to wildly incorrect. Some person might see a 13 or a 666 in a number associated with a vaccine and they might go ape, and see it as a part of Armageddon or the Antichrist.
If I heard a rumor that sounded plausible, I would contact the CDC or someone in a public health department that had actual training about vaccines.
I would not trust some airheaded person just because they appeared on Oprah.