The article focuses on the concerns related to the safety of using Tamiflu (oseltamivir) drug in defense against avian flu in Japan. Researchers state that Tamiflu may cause mental instability and suicidal tendencies. The article mentions that people are skeptical of the study on the drug by Shunpei Yokota's group as the group received funds from the Tokyo-based Chugai Pharmaceuticals, which distributes Tamiflu in Japan.