Results: At day 10 of post-infection, guinea pigs showed significant elevation ( p < 0.05) of pro-inflammatory cytokines, tumor necrosis factor ...
Guinea pigs usually receive the correct levels of vitamin A in their commercial feed so rarely is an animal deficient.

We do not recommend routine de-sexing of female Guinea Pigs unless your vet has identified a health problem, for example cystic ovaries.

Furthermore, visual representations like the one above help us fully grasp the concept of Guinea Pig Vitamin E Levels In Blood Test.
... immunologic systems, there may indeed be a call for use of the more evolutionarily "distant" guinea pig as human "guinea pigs" in laboratory testing.