It is a review of current research on the differential diagnosis of avian tumors mostlyinclude Marek's disease, avian leukosis and reticuloendotheliosis by using the polymerase chainreaction (PCR) technique The genome structures of the viruses, the unique genes or DNAfragments of each virus and their PCR primers' sites and sequences, the application PCR techniquein the differntial diagnosis of avian tumors and the comparison with the convntional diagnosismethods were reviewed in detail PCR technique is one of the most efficlent and rapid approaches todifferentiate avian tumors for its simplicity, high sensitivity and speclficity...
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