MADISON, Wis. -

Public Health of Madison and Dane County announced Tuesday that 2,000 cases of sexually transmitted infections are reported every year.

According to the release, the CDC says a large number of cases are not counted because most people with STIs do not have symptoms and do not seek testing.

One in two sexually active young people will get an STI by the age of 25, and most won’t know it, according to the release.

Officials said people can get tested at their regular clinic or a clinic for Dane County residents operated by PHMDC for STI testing and treatment. The walk-in clinic is free for all teens and free or low-cost for any uninsured adults who live in Dane County. Residents with medical assistance/BadgerCare can also visit the clinic.

Untreated STIs can cause problems ranging from uncomfortable to serious, officials said. Untreated STIs can cause unnoticed and permanent damage to the reproductive tract and infertility. Woman may also experience premature births or low birth weight babies due to STIs.

The Public Health STI Clinic is at 2705 E. Washington Ave. above the Hawthorne Branch Library in Madison. No appointments are needed. The clinic is open from noon to 3 p.m. Mondays, from 3 p.m. to 6 p.m. Wednesdays and from 9 a.m. to noon Fridays.

For more information about the clinic or questions about STIs, residents can call the confidential STI line at 608-243-0411 or go online.