Why do we use guinea pigs?

Guinea pigs have biological similarities to humans, which make them useful in many fields of research. They have been used as experimental animals for centuries; hence the term 'guinea pig' for a human experimental subject. Since vitamin C was discovered through research on guinea pigs, they have been important in nutritional research, and were also crucial to the development of: vaccines for diphtheria, TB, replacement heart valves, blood transfusion, kidney dialysis, antibiotics, anticoagulants and asthma medicines.

Information adapted from AnimalResearch.info