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Distribution of lineages between 1975 and 2012. Identification of lineage 4, non-lineage 4, or heterogenic infection in patients <5 years of age (small blue circles), ages 5 to 14 years (medium green circles), and >14 years of age (large red circles) per year between 1975 and 2012. Number indicates multiple patients at a specific time point for the youngest group. No association was found between presence of a specific lineage and year of admission.
