The use of a vest equipped with a global positioning system to assess water-contact patterns associated with schistosomiasis

Seto, Edmund Y.W. and Knapp, Freyja and Zhong, Bo and Yang, Changhong (2007) The use of a vest equipped with a global positioning system to assess water-contact patterns associated with schistosomiasis. Geospatial health , 1 (2). pp. 233-241. ISSN 1970-7096

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The real exposure to many of the tropical diseases is difficult to assess at the individual-level due to problems of recall, self-reported diaries, personnel requirements, and altered behaviour related to observation. We present a study in an area endemic for Schistosoma japonicum in which global positioning system (GPS) receivers were used for personal time-activity monitoring to assess water-contact associated with schistosomiasis transmission. The study subjects were equipped with a vest with an embedded GPS receiver for 8-hour periods. The resulting data were used to create hourly time-activity maps, which were subsequently used in interviews to ascertain the timing and location of the water-contacts. Based on a sample of twenty-four 8-hour person-days we found that individuals averaged 1.4 ± 1.2 water-contacts per day, and were surprisingly mobile, with 39% of the participants having spent time out of the village (0.8 ± 1.4 hours outside of village). Such mobility suggests the need for further research into social patterns that may facilitate the spread of parasites, and contribute to sustained transmission. We present an assessment of the accuracy of cheaper commercially- available GPS units that have shown promise in such applications. We feel that a speed-filtering method is effective in managing measurement errors commonly encountered during personal activity monitoring with GPS. We conclude that personal GPS units can help reduce recall problems associated with other methods of assessing water-contact, and that they offer valuable insights into time-activity patterns that influence schistosomiasis transmission.

Item Type: Article
Uncontrolled Keywords: global positioning system, geographical information system, exposure assessment, water-contact, Schistosoma japonicum, China.
Subjects: 600 Tecnologia - Scienze applicate > 610 Medicina e salute (Classificare qui la tecnologia dei servizi medici) > 614 Medicina legale; incidenza delle malattie; Medicina preventiva pubblica > 614.5 Incidenza di specifiche malattie e tipi di malattia e misure pubbliche per prevenirle > 614.55 Parassitosi e malattie causate da funghi (micosi) > 614.553 Malattie causate da trematodi (infezioni da trematodi) (Include la Schistosomiasi)
900 Storia, Geografia e discipline ausiliarie > 910 Geografia e viaggi > 910.285 Geographic information systems
Depositing User: Emanuele Zinevrakis
Date Deposited: 21 Jun 2010 12:19
Last Modified: 07 Jul 2010 10:18

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