Correct. Simple reason - virii aren't alive; that is, they don't respire; that is, they don't take anything (including antibiotics) in from the environment. They don't do anything at all until they come in contact with a glycoprotein trigger on the surface of a cell, then they inject the infective agent - DNA or RNA - into the target cell.
About all you can do is sensitize the immune system to build antibodies faster than the virii can replicate. Inoculation does that by building a cell line already active against a particular antigen. Pumping up the mechanism of the immune system also helps - Vitamin C, for starters, and a host of other things. All antibiotics will do is protect the body from a secondary, bacterial infection.