Infectious diseases can have a significant impact on operational readiness of military forces. This proposal describes a rapid immunochromatographic diagnostic test for gastroenteritis caused by Norovirus (NoV) infection. The test shall be used in combination with a portable reader (powered by rechargeable batteries) for automated reading and interpretation. The proposed solution is small, lightweight, and insensitive to environmental extremes such as dust, high humidity, and storage temperatures of up to 45?C. The test will have high sensitivity and specificity to differentiate from other enteric infectious agents, and shall be able to detect norovirus infection at the onset of symptoms. Time to result is expected to be 20-30 minutes, and many tests can be run in parallel. Major advantages of this diagnostic method are that it is soldier-friendly, is non-invasive, is likely to be consistent with obtaining U.S. Food and Drug Administration (FDA) clearance as a Clinical Laboratory Improvement Act (CLIA)-waived diagnostic device, and provides rapid detection of the presence of infection. The rapid identification of the diarrhea-causing pathogen will help to initiate immediate intervention.