A system and method of encouraging compliance of hand hygiene in an environment where users move from zone to zone and are required to perform hand hygiene between the zones. Users carry a wearable zone sensor which detects zones, detects hand hygiene actions, logs time of changing zones, and hand hygiene...http://www.google.de/patents/US7898407?utm_source=gb-gplus-sharePatent US7898407 - Hand hygiene compliance system
