Two sexually mature marmosets (Callithrix jacchus) showing clinical si
gns similar to those seen in wasting marmoset syndrome (weight loss, d
ecreased muscle mass, and alopecia) were evaluated for clinical and an
atomic pathologic changes. The most prominent clinical pathologic alte
rations included macrocytic normochromic anemia, hypoproteinemia, hypo
albuminemia, elevated serum aspartate aminotransferase and alkaline ph
osphatase levels, and previously unreported changes of thrombocytosis.
The principal gross and histopathologic Ending was chronic colitis, w
hich appeared to be the most important contributing factor to the deve
lopment of wasting syndrome in these marmosets.