The Centers for Disease Control and Prevention says Wisconsin leads the country in what could be the worst outbreak of whooping cough in more than five decades, the Wisconsin State Journal reports. Through July 5, Wisconsin had nearly 51 cases per 100,000 people -- nearly 10 times the national average. Through July 31, Wisconsin had reported 3,496 cases, including 2,498 confirmed and 998 probable cases.
Whooping cough is a highly contagious respiratory illness. For adults, it may seem like a bad cold, but for infants it can potentially be deadly.