I noticed (while playing my trader) that if you divest yourself and use a virus scanner to remove it, it only removes the negative effect and not the transfer.

It says in the description it removes both the negative effect as well as the transfer in the trader's NCU. It does work with plunders and ransacks, but not divests or deprives.

I haven't tested with a higher/lower QL Virus Scanner, though I would assume the problem is the same. I was using QL 90 Virus Scanners when I found out.