SALT LAKE CITY — The number of students who have whooping cough in Utah is growing.

A Granite School District spokesman confirmed four cases at Wasatch Junior High in Salt Lake City. This is on top of the seven cases that were reported at North Park Elementary in Cache County Thursday.

So far, the Salt Lake Valley Health Department is advising the district simply to warn parents, which it has done. Students who have not been immunized are required to stay away from school for three weeks. North Park has temporarily excluded as many as 15 students from attendance who were not vaccinated against the disease.

Whooping cough, or pertussis, is easily treated but highly contagious. The disease results from a bacterial infection.

During the first stage of whooping cough, the symptoms often include a runny nose, sneezing and possibly a low-grade fever.

In the second stage the person can have uncontrolled coughing spells or fits and possible whopping noise when he or she breathes in.

Symptoms can last for six to 10 weeks. 

A district spokesman in Logan said he did not anticipate that outbreak would grow exponentially.