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Fibropapillomatosis (FP) is a tumor disease associated with a herpesvirus (Chelonid herpesvirus 5-ChHV5) that affects mainly green turtles globally. Understanding the epidemiology of FP has been hampered by lack of robust serological assays to monitor exposure to ChHV5. This is due in part to inability to efficiently culture the virus in vitro for neutralization assays. Here, we expressed two glycoproteins (FUS4 and FUS8) from ChHV5 using baculovirus. These proteins were immobilized on ELISA plates in their native form, and assayed for reactivity to two types of antibodies, the full length 7S and truncated 5.7S IgY. In Florida, turtles were uniformly seropositive regardless of tumor status. In contrast, in Hawaii,...