Evaluating the usability of the OmniVis rapid cholera detection device with water quality workers in Dhaka, Bangladesh

Location: Bangladesh

Alumni: Theresa Rager

Faculty: Cristian Koepfli

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Cholera poses a significant global health burden. In Bangladesh, cholera is endemic and causes more than 100,000 cases each year. Established environmental reservoirs leave millions at risk of infection through consumption of contaminated water. The Global Task Force for Cholera Control has called for increased environmental surveillance to detect contaminated water sources prior to human infection in an effort to reduce cases and deaths. The OmniVis rapid cholera detection device aims to identify and map contaminated water sources. The aim of this study was to evaluate usability of the OmniVis device with targeted end-users in order to contribute to the iterative prototyping process. Water quality workers were trained to use the device and subsequently completed an independent device trial and usability questionnaire. Device trials identified common user errors and device malfunctions, including incorrect chip insertion and use and device power issues. Over 25 trials, the mean time to complete a test was 46 minutes 42.76 seconds, a significant reduction compared to gold standard laboratory protocols. Overall, participants found the device easy-to-use and expressed confidence and comfort in using the device independently. These results are used to make recommendations to OmniVis for further device development.





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