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Distribution of acute flaccid paralysis cases associated with type 1 cVDPVs in the Philippines in 2001. Three acute flaccid paralysis cases, in Misamis Oriental (isolate Mindanao-01-1), in Laguna (isolate Luzon-01-1), and in Cavite (isolate Luzon-01-2), are mapped by open circles. Isolate Luzon-01-2c was from a contact of the Cavite case. Shading indicates approximate population densities.
