title: Meningococcal infection in pilgrims returning from the Haj.
mesh_terms: D001428:Bacterial Vaccines / Q000008:administration & dosage; D004196:Disease Outbreaks / Q000517:prevention & control; D006801:Humans; D007514:Islam; D008589:Meningococcal Infections / Q000175:diagnosis* / Q000453:epidemiology / Q000517:prevention & control; D012529:Saudi Arabia / Q000453:epidemiology; D014195:Travel; D006113:United Kingdom / Q000453:epidemiology
chemical_list: D001428:Bacterial Vaccines