RESULTS : Homozygosity of allele 1A1 of SP-A2 increased the risk of meningococcal disease ( odds ratio [ OR ] , 7.4 ; 95 % confidence interval [ CI ] , 1.3-42.4 ) ; carriage of 1A5 reduced the risk ( OR , 0.3 ; 95 % CI , 0.1-0.97 ) .
O O O O O O O B-GeneOrGeneProduct O O O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O