GREENWOOD, Ind. -- Health officials say a school bus driver in suburban Indianapolis possibly exposed students to whooping cough. Johnson County health officer Craig Moorman says tests are being done to confirm whether the driver for the Center Grove district suffered whooping cough. Moorman tells the Daily Journal (http://bit.ly/UT5gS1 ) that a physician treated the driver for the highly contagious illness, which causes coughing, spasms and vomiting.