Since I'm in the health sciences, maybe I can help a little with the concerns about it not being an exact science. The main issue arises in inter-individual differences. Every individual is different in tiny ways from each other, and not all of these are known. A really good example is humans and antidepressants. Some antidepressants will work really well for one person, but not another, and there's no way to tell without trying the drug. Some depressed people can't get relief from any of the antidepressants currently on the market, which is one of the reasons they keep on coming out with new ones. Not all of the molecular reasons for this inter-individual variance are well known.
In a study of a drug, they use animals that are nearly genetically identical, all on the same food, and all the same age. In that group, they will still see a range of side effects and desired effects. When you add genetic differences, food differences, age, gender, other environmental factors, etc, the list of possible variations just becomes too big. The best way, in my opinion, to do this kind of thing is to 1) do a culture and sensitivity test if at all possible, and 2) if that's not possible start with the antibiotic that the vet thinks is most appropriate. If you see bad side effects without a significant improvement in the infection, switch. We should be open to trying anything that works and be flexible to changing the treatment in case something isn't working.
Anyway, that's just my perspective from the classes I've taken about how discovering and developing new drugs works. You cannot imagine how many differences there can be between individuals both from a genetic standpoint and a lifestyle standpoint. With rabbits, it's really different too. We have bunnies that weigh 25 lbs and bunnies that weigh 2; short ears, long ears, floppy ears; all different hair types, colors, and lengths--and that's just how they look on the outside. Not everybun is an 8lb New Zealand red-eye white--which is the most common bunny for drug tests--and this great diversity makes bunnies so wonderful.
Sorry for the long-winded rant. Naomi looks good and I'm glad she has a fluffy buddy and devoted mom to help her through this. Who is the cute fluffer, by the way?:biggrin2: