EMMAUS, Pa. - Cases of whooping cough have been reported in the East Penn School District.

Students who attend Emmaus High School, Lower Macungie Middle School, Shoemaker and Wescosville Elementary Schools have been diagnosed with Pertussis, or whooping cough, the district informed parents in a letter.

The students are under the care of a physician, according to the letter.

The Centers for Disease Control and Prevention has more information about whooping cough, including typical symptoms, treatment, and prevention.

If a child is coughing frequently or experiencing coughing fits, parents should promptly contact the child's doctor, the letter said. If the child is not coughing, parents may choose to contact the child's doctor and explain that he or she may have been exposed to a case of whooping cough.

All people being adequately immunized would help control the future spread of whooping cough, according to the letter. The pertussis vaccine, DTap, is only given to children under 7 years old. A new combination tetanus, diphtheria and acellular Pertussis vaccine (Tdap) has been approved for use in adolescents and adults.