Then don't tax it. Rather than that, stop subsidizing it. Also pass legislation for propely labelling meat from livestock treated with antibiotics, listing the types of antibiotics used and the trace amounts present in the meat.
In the US, current labeling standards allow farms not using antibiotics to differentiate themselves by stating as much on the label (they must not use antibiotics as a feed additive).
https://www.fsis.usda.gov/wps/wcm/connect/6fe3cd56-6809-4239...