An unconfirmed case of tuberculosis has been reported at a Des Moines high school. State Epidemiologist Patti Quinlisk says better treatment and fewer cases brought in by foreigners have led to a decline in t-b in the Hawkeye state.The state has averaged between 50 and 70 cases a year, but last year there were only 40 cases. Quinlisk says the first thing to do is you should do if you think you’ve been exposed to tuberculosis is to call health officials. She says they can assess whether the case is actually contagious.Quinlisk says the disease can be easily treated. She says the disease can be treated with antibiotics, and the person will recover.