| carriage of neisseria meningitidis and neisseria lactamica in a school population during an epidemic period in spain. | a study was made of the incidence of neisseria meningitidis and n. lactamica in a school population; 2470 children aged between 5 and 7 years were studied from four schools in alcala de henares (madrid). nasopharyngeal swabs were taken in june, november and march, between 1979 and 1983. in all the surveys except one, the proportion of carriers of n. lactamica was higher than that of n. meningitidis, reaching a ratio of about 2:1 in the complete study. the predominant serogroup of meningococcus f ... | 1985 | 3924995 |