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DES MOINES, Iowa (AP) - Gov. Chet Culver says test have confirmed Iowa's first confirmed case of swine flu, prompting him to declare a public health emergency in the state.

Culver announced Saturday that the Centers for Disease Control and Prevention confirmed the swine flu diagnosis in a southeast Iowa woman who became ill after returning from Mexico. Since her arrival in Iowa, she traveled through Johnson, Des Moines and Muscatine counties.

Culver says tests for a second probable case of swine flu were negative.  In addition, state health officials are reporting seven new probable cases of the flu, six in Marshall County and one in Tama County.

Schools in the Marshalltown Community School District will be closed until at least May 10 as a precautionary measure. Phil  Roeder, a spokesman for Culver, says officials made the move because most of the new cases reported in Marshall County involved school-age children.

(Copyright 2009 by The Associated Press. All Rights Reserved.)