Comparison of the efficacies of amantadine treatment of swine-origin influenza virus A H1N1 and seasonal influenza H1N1 and H3N2 in Japan (2008-2009).

Amantadine is not thought to be effective for the treatment of swine-origin influenza virus (S-OIV) based on an analysis of genetic sequences of the M2 protein. However, the actual clinical efficacy of amantadine has not been well documented. Here, we were able to compare the efficacies of amantadine and neuraminidase inhibitors.