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In total, 39 clinical cases of fowl adeno-viruses (FAdV) infection in chickens (28 broiler, 7 na-tive, and 4 layer chickens) between 2007 and 2010 in Korea were investigated. The FAdV types 4, 8b, and 11 comprised 18, 9, and 12 clinical cases, respectively. All FAdV type 4 cases showed clinical hydropericar-dium (HPS) lesions as well as inclusion body hepatitis (IBH), whereas all FAdV types 8b and 11 cases exhibit-ed IBH lesions without HPS. All 3 types were detected in broiler (9-30 d old) and layer chickens (23-112 d old), whereas most native chickens (14-65 d old) were affected only by FAdV type 4. Infectious bursal disease virus and chicken infectious anemia virus were com-plications in 51.3% of FAdV cases, with mortalities of 55% to <0.1%. Chicken infectious anemia virus was de-tected in all native chicken cases. These results indicate that preventive measures against FAdV infection and immunosuppressive diseases on poultry farms should be implemented. [ABSTRACT FROM AUTHOR]