Show Me the Science | Hand Hygiene | CDC- areas hand most often missed hand washing ,These areas are most often missed by healthcare providers when using alcohol-based hand sanitizer: Thumbs; Fingertips; Between fingers . References. Widmer, A. F., Dangel, M., & RN. (2004). Alcohol-based hand rub: evaluation of technique and microbiological efficacy with international infection control professionals.Body, Mind and Whole: Happy Hands: Correct Hand-washing ...The areas of the hands that contain the most germs are the most commonly missed during hand washing. These areas include but are not limited to: the fingertips, most of the back of the hand and thumb, the areas in between the fingers, and parts of the palm and forearm.