Swine flu vaccine: present status.

In early 2009, "swine flu", a new infectious disease, emerged in Mexico and further spread around the world. It is currently accepted as the most problematic infection at present. To control this new infection, the swine flu vaccine is the hope. The reasons that we need the swine flu vaccine will be discussed. Also, the present status, current attempts and problems of swine flu vaccine development will be presented in this commentary.