[CobaltBlue]

Here's a link to Ligand's "pipeline" of drugs being developed. I don't see anything that would be useful against viral infections. My guess is that the increase in share prices is due to Targretin being approved for the treatment of non-small cell lung cancer.
http://www.ligand.com/products/pipeline.htm

[CobaltBlue]

Bad guess, probably Avinza, extended release morphine, approved March 2002. Caveat, I don't know jack about biotech.