It turns out the the immunity afforded by the much vaunted meningococcal vaccine is rather short-lived. This is not exactly a huge surprise, given the inadequate research done by Chiron in to the effectiveness of the vaccine. In fact their packet insert says.
“The degree and quality of the cellular immune response is not yet established.”
Which means, in layman’s terms, “we don’t know whether this stuff works”. And even better:
“No prospective efficacy trials have been performed with MeNZB.”
Translation: The reason why we don’t know is that we haven’t tested it properly, yet. And the real doozy: