A fast, simple and high throughput array-based method for typing pathogens will be developed. Capture probes will be designed to target norovirus and hepatitis A virus, clinically-important Salmonella serovars and Campylobacter spp. To evaluate probe specificity, viral RNA or bacterial DNA will be extracted from clinical samples or cultured strains. A Cooperative Research and Development Agreement (CRADA) has been established with Arrayit Corporation to develop a fast, simple, and cost-effective test, in conjunction with inexpensive instrumentation.