MITCHELL, S.D. (MITCHELLNOW) This flu season is setting records for cases across South Dakota. There have been more than 20-thousand cases this year, according to the state health department. The rising number is the highest in ten years, with 43 deaths reported.  Doctors say the season peaked around the middle of February and is now in decline, putting it on par with most years. Officials say not as many people are getting the flu shot, which has proven to be effective. Officials continue to recommend getting vaccinations each year so people can stay out of the hospital and not get as sick when catching the flu.