Is basically a wrist band that use human heat to reach reactive reaction of strips. The temperature for detect e-coli bacteria is 37 C.In places with low access to technology and resources, is necessary to provide simple access to data. In rural farm, reactive wrist could be made of nonwoven fabric that could be burned after use. For urban environments, sanitary authorities could use a long term detection device connected with an mobile app to place in a map positive cases. This design incorporate chemical tools for early detection. Also, incorporate simply resources like human heat to create chemical reaction. Where resources allow, internet could be used for data transmission generating a map for positive cases. This map is a diagnostic for health authorities. This map is feed with data provided with an app in real time. Maps could be done with free resources like Carto db.