Hasn’t animal research been essential to finding cures and doing research on big killers such as AIDS and cancer?
Animals do not serve as good models for human beings. Drugs such as thalidomide (linked to severe physical deformities in human infants) and Opren (an arthritis drug that destroys human livers) have no harmful effects on rodents. The differences between the physiologies of all species are just too complex. Forty-six percent of the substances that are carcinogenic in mice are not found to be carcinogenic in rats. Guinea pigs will die when injected with penicillin.