Beef and bird flu

The last weeks a lot of protests about the US beef import has been seen on the streets and in the news papers. Companies selling beef products have been quick to assure that they do only use Korean beef, and none of the supposedly mad cow infected US ones... I'm not sure what they feed Korean cows with, but it is probably not healthy. So now I try to choose tofu or fish.
The weirdest part is that the birdflu has arrived to Seoul. But it does not make the headline were patriotic korean lament their goverments weakness in giving in to US demands. The protection of the domestic market for food products is a huge issue. Most Koreans are willing to pay 4 times the world market price for rice to get Korean rice. I wonder what my economic professor says about that...