Infection risk is mitigated by antiseptics (Old Man Beard Dressing and Peroxide Bottle).  It is only eliminated if it is reduced below 0%.  Otherwise it continues to grow in percent for a while (12-ish hours ?) before attempting to become an infection, presumably at the percent chance it had when its timer ran out.  If it reached 100% I think it would always trigger. The first aid system was reorganized recently and has introduced a  lot of confusion.  It used to be that treating a cut with