Prolonged outbreak of B meningococcal disease in the Seine-Maritime department, France, January 2003 to June 2005.

Between January 2003 and June 2005, an outbreak of meningococcal disease occured in the department of Seine-Maritime in northern France. Eighty six cases were notified, giving an average annual incidence of 2.7 cases per 100 000 inhabitants, compared with 1.