Here's a snippet from the Embassy.
A specific vaccine for humans that is effective against avian influenza has not yet been developed. Based upon limited data, the CDC has suggested that the anti-viral medication Oseltamavir (brand name-Tamiflu) may be effective in preventing or treating avian influenza. Using this input, the Department of State has decided to pre-position the drug Tamiflu at its Embassies and Consulates worldwide, for eligible U.S. Government employees and their families serving abroad. Tamiflu may not be readily available overseas and the State Department encourages American citizens traveling or living abroad that are interested in obtaining this medication to consult with their physician. There is no provision for the U.S. Government to provide American citizens traveling or living abroad with medications, including in the event of a pandemic.
Americans who are planning travel to a country that has reported the virus or who are concerned about the Avian flu are advised to monitor the CDC and the WHO web sites for the latest information.
In other words, if the H5N1 strain breaks out here, I'm screwed. I'll be on the first plane home.