Figure 3From: Optimizing strategies for meningococcal C disease vaccination in Valencia (Spain) Percentage of protected individuals with the 2-12-144 months strategy. The circles are the result of the seroprevalence study in 2011, squares correspond to natural immunity, upward triangles reflect seroprotection in January 2016 (two years after implementation of the new strategy), and the downward triangles correspond to the long-term protection achieved in September 2040.Back to article page