Bird flu caused by a virus is very susceptible to occur at this time, it is caused by a weak immune system. Most people who are infected with the bird flu virus are those who often have direct contact with poultry, one of the causes is touching infected birds and contact with poultry body fluids, namely poultry saliva. This expert system was built to diagnose bird flu caused by viral infections. From this expert system can provide information about disease, its definition, treatment and prevention. This expert system uses the Forward Channing method. The results of consultation tests with this system show that the system is able to determine the disease along with the initial treatment and treatment that must be carried out, based on the symptoms previously selected by the user.Keywords: Expert System, Diagnosis, Avian Flu, Case Based Reasoning, Certainty Factor.
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