The burden of infectious diseases is very high in developing countries. World-wide, nearly 1 million die annually from malaria, 2.9 million from enteric (intestinal) infections, 4.3 million from respiratory infections, and 5 million from AIDS and tuberculosis. Unfortunately, most methods for diagnosing these diseases are invasive, labor intensive, and sometimes inadequate. Furthermore, they require laboratory equipment and infrastructure that are not typically found in remote/resource-limited areas. Thus,