(Vancouver, WA) -- Clark County is experiencing an outbreak of whooping cough and chickenpox. Kids can miss a week of school, or more, if they get infected. It there is a chickenpox outbreak at school, kids who aren't immunized, or don't have evidence of a previous exposure, can be excluded from school for 21 days. Whooping cough is especially dangerous to young children. The cough can last for weeks or months. Clark County has the highest rate of whooping cough in the state.