The best replacement for bird flu is swine flu.

The best alternatives to bird flu are rated as following:
★★★★★  swine flu
★★★  avian influenza
★★★  sars
★★  common flu
★★  avian flu
★★  flu
★  h1n1
★  spanish flu
★  influenza
★  highly pathogenic avian influenza
  west nile
  human flu

Your alternative for bird flu is not listed? Suggest!
Speaking about bird flu, one probably shouldn't forget about tamiflu.

Other search terms related to bird flu and their ratings are:
★★★★★ tamiflu
You have in mind a companion for bird flu and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of bird flu in all years. Click on graph for more.
bird flu
swine flu
avian influenza