You are fight about the principles of evolution being applied in the studies of viruses and bacteria.
Creationists should also consider the possibility that there is a reason why testing drugs and medical procedures on animals provides useful information on how they will affect people.
Actually, most of the so called "research" on animals is totally useless and very often produces results that are at best unhelpful, and at worst, detrimental to actual progress in developng human medical advances. Very often many, not all, so called animal researchers are "scientists" making a lot of money on useless animal research.