"...one giant leap..."?
D001428:Bacterial Vaccines; D002353:Carrier State; D006801:Humans; D008589:Meningococcal Infections / Q000517:prevention & control*; D008887:Military Medicine; D009345:Neisseria meningitidis / Q000187:drug effects / Q000276:immunology; D010403:Penicillin Resistance; D010406:Penicillins / Q000627:therapeutic use; D011135:Polysaccharides, Bacterial; D013449:Sulfonamides / Q000494:pharmacology / Q000627:therapeutic use; D014611:Vaccination
D001428:Bacterial Vaccines; D010406:Penicillins; D011135:Polysaccharides, Bacterial; D013449:Sulfonamides