The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.
Most cases in children are mild, although they will feel unwell and will need to miss school or nursery for several days.
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FT Edit: Access on iOS and web
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