CHATHAM, N.J. (CBSNewYork) – A New Jersey middle school is warning parents about pertussis, or whooping cough.

Chatham Middle School reports one confirmed and one suspected case.

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“Pertussis is a highly contagious disease that is spread through the air by a cough or a sneeze,” the school district said in a letter to parents. “Pertussis begins with cold symptoms and a cough, which become much worse over 1-2 weeks.”

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Symptoms include:

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  • Long series of coughing fits followed by a whooping noise. However, older children, adults and very young infants may not develop the whoop.
  • Coughing fits may be followed by vomiting, turning blue, or difficulty catching breath.
  • Cough is worse at night and cough medication usually do not help.

If you notice these symptoms, contact your health care provider. For more information on pertussis, click here.