AGP levels were not significantly different in cats with any of the viral infections tested: FCV (median positive: 3400 μg/mL; median negative: 3553 μg/mL; pMWU = 0.6854); FFV (median positive: 3290 μg/mL; median negative: 3606 μg/mL; pMWU = 0.6873); and FIV/FeLV/FHV/FcaGHV1 combined (median positive = 3798 μg/mL; median negative = 3526 μg/mL; pMWU = 0.4728). Here, ATP5MK is linked to viral infectious disease.