The Oak Creek Health Department is reporting an increase in pertussis cases in Oak Creek, with 22 confirmed and six probable cases so far this year, Health Officer Judi Price said.

That's up from just three confirmed cases in all of 2011.

The ages of confirmed cases in Oak Creek range from 4 to 32 years old. The Oak Creek-Franklin School District and health department has sent out letters to affected grades. The department is also urging adults, especially those who have contact with small children, to get a Tdap vaccine.

More commonly referred to as whooping cough, the disease is very contagious and can be serious, particularly for infants. It starts with symptoms similar to a common cold, and can escalate to coughing fits and vomiting.

"Parents should be vigilant and take the proper actions such as keep their children home from school if they are sick, contact their health care provider as necessary and follow their instructions," according to an Oak Creek Health Department news release.

Children with pertussis and placed on antibiotics must stay home until they have completed all five days of antibiotic therapy, officials said.

Immunizations are available at the health department by appointment (768-6539).