In 144 children in School A, there was laboratory evidence of only MenA infection for 11 children (7.6%), only MenB infection for 2 children (1.4%), only MenC infection for 9 children (6.3%), only Men W for 2 children (1.4%), MenA plus MenC for 9 children (6.3%) and MenA plus MenB plus MenC for 1 child (0.7%). Here, ELL is linked to infection.