Build a Java mobile application that runs on low cost mobile phones and uses the Extensible Messaging and Presence Protocol (XMPP), an instant messaging and presence protocol with widespread adoption, to enable the following:

Field workers collect samples, carry out tests. Health workers post symptoms, test results. Results can be sent in real time to experts. Experts respond with advice, recommendations, and prescriptions (can be in real time with the use of XMPP).