you may request the flu vaccine in a single dose vial from your physician--strongly suggest one do so prior to flu season and the physician's ordering date. I know the single dose vial preparation is slightly more expensive than the vaccine from multiple dose vials. At family doc's office, friend was told the only single dose vials on hand were for children, so she could receive that and return for a 2nd dose if she wished (unsure why she was not offerred both injections at the initial visit). rather disincentive for taking flu vaccine without the thimerasol--2 injections or 2 trips to the physician's office--not to mention 2 charges (1 of which i would guess will be disallowed by the insurance company). request single dose vials early....