A scientist who is also a human being cannot rest while knowledge which might be used to reduce suffering rests on the shelf.

The work on [polio] prevention was long delayed by... misleading experimental models of the disease in monkeys

My own experience of over 60 years in biomedical research amply demonstrated that without the use of animals and of human beings, it would have been impossible to acquire the important knowledge needed to prevent much suffering and premature death not only among humans but also among [other] animals.

Without animal research, polio would still be claiming thousands of lives each year.

I have studied the effects of our new lots of polio vaccine in 100 adult volunteers and during the next few days shall give it to my wife and 2 children as well as to our neighbors and their children.

Giving cancer to laboratory animals has not and will not help us to understand the disease or to treat those persons suffering from it.