This article seems to be pretty one-sided though. What's the medical researchers' perspective? Surely in this situation the people involved should be engaged, not simply portrayed as soulless monsters.
Yes, repeated experiments on chimpanzees sound especially cruel. However, let's not forget that there are thousands, if not millions of people who are slowly dying from hepatitis C in Africa, India, Pakistan, etc. Unfortunately, with many diseases there is only one or very few species of animals on which the disease can be studied, and usually only emulation of the disease in primates gets to be sufficiently close to the clinical presentation/pathology in humans. At the same time, there are orders of magnitude more animals killed for food every day than there are animals used for research. At least once a week I see a killed squirrel or bird on a small road that goes to our apartment - there's 20 miles an hour limit and it still happens.
I am not advocating for needless cruelty in experiments on animals, especially on primates. As much as possible, these experiments should be avoided and used only when necessary. At the same time, this issue has not been ignored and scientists have been the first ones to come to realization that ethical standards in research, animal and otherwise, are needed. There are national and international standards and protocols on animal research, and there must exist competent people who assess the way these experiments are carried out, especially when it comes to chimps. So it would be nice to hear not only from animal rights advocates' side but also from the scientists themselves and from some more independent sources. I wish we could have a more informed conversation. Mindlessly dehumanizing scientists is just as bad as mindlessly being cruel to animals.