1. A computerized medical diagnostic system, comprising: means for repetitively asking questions over time to elicit responses from a patient, wherein the responses establish time varying symptoms, and each established symptom contributes a weight to a disease; means for determining one or more synergistic weights based on the symptoms established over time; means for accumulating established symptom weights and determined synergistic weights as a cumulative weight for the disease; and means for determining whether the cumulative weight for the disease reaches or passes a threshold so as to declare a diagnosis.