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However, it remains a challenge to track the proximity-based interactions of a whole community and then model the social diffusion of diseases and behaviors starting from the observations of a small fraction of the volunteer population. In this paper, we propose a novel approach that tries to connect together these sparse observations using a model of how individuals interact with each other and how social interactions happen in terms of a sequence of proximity interactions. We apply our approach to track the spreading of flu in the spatial-proximity network of a 3000-people university campus by mobilizing 300 volunteers from this population to monitor nearby mobile phones through Bluetooth scanning and to daily report flu symptoms about and around them. Our aim is to predict the likelihood for an individual to get flu based on how often her\/his daily routine intersects with those of the volunteers. Thus, we use the daily routines of the volunteers to build a model of the volunteers as well as of the non-volunteers. Our results show that we can predict flu infection two weeks ahead of time with an average precision from 0.24 to 0.35 depending on the amount of information. This precision is six to nine times higher than with a random guess model. At the population level, we can predict infectious population in a two-week window with an r-squared value of 0.95 (a random-guess model obtains an r-squared value of 0.2). These results point to an innovative approach for tracking individuals who have interacted with people showing symptoms, allowing us to warn those in danger of infection and to inform health researchers about the progression of contact-induced diseases.<\/jats:p>","DOI":"10.1145\/3328912","type":"journal-article","created":{"date-parts":[[2019,6,24]],"date-time":"2019-06-24T13:45:01Z","timestamp":1561383901000},"page":"1-23","update-policy":"http:\/\/dx.doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":14,"title":["PocketCare"],"prefix":"10.1145","volume":"3","author":[{"given":"Wen","family":"Dong","sequence":"first","affiliation":[{"name":"University at Buffalo"}]},{"given":"Tong","family":"Guan","sequence":"additional","affiliation":[{"name":"University at Buffalo"}]},{"given":"Bruno","family":"Lepri","sequence":"additional","affiliation":[{"name":"Fondazione Bruno Kessler"}]},{"given":"Chunming","family":"Qiao","sequence":"additional","affiliation":[{"name":"University at Buffalo"}]}],"member":"320","published-online":{"date-parts":[[2019,6,21]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pmcj.2011.09.004"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1503\/cmaj.121442"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0135740"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1140\/epjst\/e2013-01927-7"},{"key":"e_1_2_1_5_1","unstructured":"Andrei Borshchev. 2013. 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