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

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.

While it is true that the media tends to prioritize sensationalism and newsworthy topics, there could be other reasons why the media does not talk about bird flu as much anymore. Here are a few possibilities:

1. Declining importance: Over time, the severity and impact of certain issues may decrease, and this could be the case with bird flu. If there haven't been any major outbreaks or significant developments related to bird flu recently, the media may not find it as newsworthy.

2. Shifted focus: Media outlets often adapt their coverage based on current events and public interest. If there are more pressing issues or emerging threats that capture public attention, the media may choose to prioritize those topics instead.

3. Availability of information: Another factor could be the availability of information. If the scientific community has made significant progress in understanding and mitigating bird flu, resulting in fewer newsworthy updates or breakthroughs, the media may not have much to report on.

4. Perception of public interest: Media organizations also consider what their audience wants to hear about. If the public, in general, seems less concerned or interested in bird flu, the media may allocate less coverage to the topic.

It is important to note that these are speculative reasons, and it is challenging to pinpoint a single definitive answer without further research or insight from media professionals.