Four Cobb elementary schools reported 18 cases of whooping cough last month. The number was larger than the handful of cases typically reported during cold and flu season, said Joy Wells with Cobb and Douglas Public Health Department. Coughing students were tested, and those with the infectious cough were treated with antibiotics before they could return to school. Cobb School spokesman Jay Dillon said Mountain View Elementary had one case and the rest were concentrated at Garrison Mill, Timber Ridge and Rocky Mount schools. All of the schools are in east Cobb.