Where, when and how was the meningococcal vaccine discovered?

The US Army! The us army needed some way to reduce meningitis in recruits during the viet nam war. Us army doctors developed, tested, and used the first meningitis vaccine in the early 1970s. Vaccines aren't "discovered, " they're made by scientists through rigorous research. The first such vaccine was for smallpox, which we have eradicated! thank dr. Edward jenner.