I am looking for why the media does not talk about bird flue , any more?

Question

Is there is some reasons why they do not talk about it anymore, do u have any idea?

Yes. It does not sell anymore. Media tend to go with sensationalism, and not cover subjects that are well worn. Some of these well worn subjects:
the explosive HIV infection rate in third world countries
Bird Flu
The pervasive organized crime in the former Soviet Union and satellite countries.
Political "contributions" and back scratching in the US.
Federal deficit in the US
Illiteracy rate in the US
The shrinking water supply in the American West.
poverty

In local papers, seldom does one see any articles about pollution caused by local businesses and industries. Guess why.