diagnostic criteria , based on a fourfold or greater rise in antibody level and/or a high specific antibody level , correctly identified 85 % of group a meningococcal diseases , 90 % of group c meningococcal diseases , and 78 % of h. influenzae type b diseases in children older than but only 15 % in infants younger than 1.5 years of age .
C0008059
children
C0021270
infants