In spite of sporadic occurrence of Invasive Meningococcal Diseases (IMD), epidemics with high death rates and Seque/ae are nothing exceptional. N. Meningitidis B was replaced by a new clone of N. meningitidis C: 2a: P1.2 (P1.5). Recruits of military troops deployed in the O/omouc district have occurred among the first afflicted. The clinical outlook resulted even in few deaths. Mass immunization of all the recruits demonstrated increasing immunization coverage reaching up to 98 % in 1998. Vaccine against A+C (Pasteur Merieux) has been used. The mass immunization of all the recruits was followed by a substantial decrease of IMD incidence, which has a/most disappeared Since that time.....

Keywords: IMD - Invasive Meningococcal Disease; Meningococcal meningitis; Military troops; Mass immunization