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In 1977, from March through April, 16 strains of N. meningitidis were isolated among 400 healthy subjects: 334 school-children 6-11 years of age and 66 adults, with a carrier rate of 3.85% and 4.5% respectively. The serological identification carried out by slide agglutination showed: 1 strain belonging to serogroup A; 4 strains to serogroup B; 1 strain to(More)
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