Fig. 4

HCW contacts and hand-hygiene compliance. a Contact patterns of a single HCW (113, ASH) during a specific day, informed by hand-hygiene compliance data. Bottom each dot represents a visit to a room, and its color depends on the use of HAS, or lack thereof, after a contact with the patient in the room (red no use; light green use; dark green bathroom; yellow no contact with the patient). Top each bar gives the duration of a contact of HCW 113 with another HCW, identified by a specific color. The colored dot indicates if HCW 113 had used HAS in the previous visit (same color code as in the bottom plot). The red line in some colored bars indicate that the HCW in contact with HCW 113 had previously visited a patient room with successive lack of HAS use. b Bar chart giving the aggregate duration of the contacts of each pair of HCWs. Only encounters between HCWs of which at least one wore a MediHandTrace (MHT) tag monitoring hand-hygiene compliance, and had a contact with a patient before the encounter, are considered. Each duration is divided into two parts corresponding to different hand-hygiene compliance (green correct use of HAS of the HCWs monitored by the MHT infrastructure before the contact; blue no use of HAS after contact with the patient and before the contact for at least one of the two HCWs involved). c Bar chart giving, for each HCW, the aggregate duration of his/her contacts with other HCWs after contact with a patient. Each aggregate duration is divided into two parts corresponding to different hand-hygiene compliance (green correct use of HAS after contact with the patient and before the contact with the other HCW; blue no use of HAS). MED medical doctors; NUR nurses; NURA nurses’ aids; HKS housekeeping staff; HAS hydroalcoholic solution