CHICAGO (CBS) — Illinois’ top health official says myths about vaccination may be one reason why this state is seeing so many new cases of whooping-cough.

READ MORE: Sources: Illinois State Trooper, Woman Found Shot Dead In Car On Southeast Side

Last year in Illinois, there were more than 2,000 cases of pertussis, better known as whooping cough.

State Health Director Dr. LaMar Hasbrouck says the disease is preventable by vaccine.

READ MORE: In Wake Of Shooting That Killed 8-Year-Old Melissa Ortega, Community Leader Calls For Mental Health Clinics, Funding To Prevent Crime In Little Village

So, he said, a rise means many aren’t getting their shots.

Some are purposely not getting their kids vaccinated, he said.

MORE NEWS: Even In Ever-Changing Time Of COVID, An Evanston School's Dedication To Brighter Days Never Wavers

Hasbrouck is the guest on WBBM Newsradio’s “At Issue” program, and you can hear more of his comments Sunday at 9:30 a.m. and 9:30 p.m.