Abstract
An outbreak of meningococcal infection which took place in a nursery in Rioja, Spain, is reported. Between November 1981 and February 1982, 11 patients had meningitis with or without septicaemia. Two died. Three meningococcal strains from the patients isolated were studied. All three were group C type 2 and were resistant to sulphadiazine (MIC 50 mg/l) but susceptible to penicillin, ampicillin, chloramphenicol, rifampicin and spiramycin. This outbreak took place during an epidemic in which serogroup B was the most prevalent in Spain. Two surveys before and after chemoprophylaxis were made to determine the carrier rate in the nursery population. The strain causing the outbreak was found in 2.5 and 4 per cent of persons respectively. Rifampicin was administered to all carriers after the first survey and to carriers of the virulent strain after the second survey. The remaining children were given polysaccharide C vaccine. No more cases arose after this last prophylactic measure.
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