| It does not protect against disease caused by other groups of meningococci. |
| In the past 30 years, meningococci serogroups B and C have been responsible for most disease in the Americas and Europe. |
| A study of the virulence of meningococci for man and of human susceptibility to meningococcic infection. |
| Group A meningococci have been the main cause of meningitis epidemics in Africa and account for about 80 to 85 percent of all cases. |
| When meningococci invade the bloodstream, some gain access to the skin and cause bloodstained spots, or purpura. |
| One of the mysteries of the disease is that many people carry meningococci in their throats without becoming ill. |
