Bird flu in a dream is read symbolically as worry spreading through a group or fear of something invisible. Dream books take it as a reflection of anxiety, not as anything about health.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.