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AHRI report No.18
EPIDEMIOLOGICAL STUDIES ON DUCK VIRAL HEPATITIS
aiwan Provincial Research Institute for Animal Health, Tan-Sui, Taipei, Taiwan, R.O.C.
Yong-Siu Lu
This study succeeded in f"mding serologic evidence of duck hepatitis virus (DHV) in many kinds of domestic fowl. The antJ"body investigation revealed that 55% of duck flocks in Taiwan had been exposed to DHV. The antibody response of five survivors were evaluated for 120 days. Twenty-three strains of DHV were isolated from intestines of Common carp and Tilapia taken from ponds where affected ducklings were raised. The titer was 1042.7-4.2 PFU/ml. Virus could be iaolated from f"JSh of the same pond even six years after the last DVH outbreak. V"U11Bes isolated from f"JSh were pathogenic to S days old duckling and produced typical lesion of DVH. DHV (102.0-3.6 PFU/ml) was recovered from Tilapia 3-5 days after oral inoculation with 0.1 ml of Hunei-6 strain (105.2 PFU/ml). DHV (101.9-5.9 PFU/ml) was also . recovered from Tilapia 2-7 days after feeding with intestines of ducklings died by intravenous injection with I-Lan strain (107.0 EID50/ml). The data strongly suggested that Common carp, Tilapia and domestic fowls acted as a reservoir or carrier for DHV. They provided constant SQurces of infection and made it difficult to prevent DVH outbreak.
DUCK VIRAL HEPATITIS ;DHV