While the national spotlight continues to shine on the swine flu outbreak, whooping cough has become enemy number one at Princeton University.

The university has confirmed nine cases of whooping cough. All of the confirmed sick are students, according to Princeton. The first was diagnosed March 28, while the most recent was confirmed this week.

The school has issued an advisory to warn students and staff of the symptoms, as well as let them know where booster shots can be obtained.

Campus Hygiene Advisory Mayo Clinic CDC