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Eric Jackson, 2 of Denver covers his mouth when he coughs as Dr Ned Calonge, Chief Medical Officer reads a book at the Children's Museum in Denver, Colo., on Wednesday, April 25, 2007. Sate and local health official came to the Children's Museum to announ

Eric Jackson, 2 of Denver covers his mouth when he coughs as Dr Ned Calonge, Chief Medical Officer reads a book at the Children's Museum in Denver, Colo., on Wednesday, April 25, 2007. Sate and local health official came to the Children's Museum to announ