Animal research/experimentation is a misleading, conglomerate driven force that makes us all believe it is the only/best way to do biological and medical research for the benefit of humans. The reason it is conglomerate/pharmaceutical driven is because these organizations must rely on animal experimentation to get funding.

What affects an animal has for the most part no relationship to how it affects a human

Yes, there are relatively few instances where how something affects humans is the same as how it affects an animal, but leaving that up to chance as we do research is absolutely not the way to do this!

PCP, which has a violence inducing affect on humans is sometimes used as a horse tranquilizer.

Not only are humans biologically, physiologically different than animals, but each animal is biological/physiologically different from one another.

Due to the fact that animal experimentation/research for the most part (relatively speaking) has not had positive results, researchers started to rely on more extreme methods, such as injecting human DNA into animals so that the animals become more human when they do their research. This causes bacteria/virii which normally would not have been able to penetrate a human, to learn through animals being used as a human DNA surrogate, and therefore becoming stronger and knowing how to attack human cells. Hence the topic of this article and antibiotics becoming less and less effective.

edit, references:

1. Lethal Medicine (Documentary)

Part 1: http://www.youtube.com/watch?v=9iYOTH_krTk

Part 2: http://www.youtube.com/watch?v=KF3yn4-9obw

Part 3: http://www.youtube.com/watch?v=v8Rp9xxW2yc

Part 4: http://www.youtube.com/watch?v=ld8F9yhUb4M

2. http://www.livescience.com/7962-human-dna-injected-animals.h...

http://www.nbcnews.com/id/7681252/ns/health-cloning_and_stem...

-In 2004, researchers looking to study viral infections injected human blood stem cells into pigs. The unexpected result: pig cells, human cells and some that combined bits of both developed in the pigs' blood.

-In 2005, researchers created a flock of sheep with bits of human organs growing inside of them, part of an effort (alson carried out in pigs) to eventually create human organ factories.

-Some lab monkeys pack a human form of the Huntington's gene which allow scientists to investigate the development of the disease.

-There are mice with human-like livers that allow studying the effects of drugs.