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Hepatitis-Hydropericardium Syndrome. Caused by: Fowl Adenovirus (FAdV) Group I, Serotype 4 (FAdV-4); The liver is significantly swollen and discolored, appearing pale, tan. Petechial haemorrhages are present on the liver surface. Image by Dr. Katriel Elrom, 2026.

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Hepatitis-Hydropericardium Syndrome. Caused by: Fowl Adenovirus (FAdV) Group I, Serotype 4 (FAdV-4);
Severe hydropericardium (clear, straw-colored fluid in the heart sac). Image by Dr. Katriel Elrom, 2026.

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Hepatitis-Hydropericardium Syndrome. Caused by: Fowl Adenovirus (FAdV) Group I, Serotype 4 (FAdV-4);
Severe hydropericardium (clear, straw-colored fluid in the heart sac). Image by Dr. Katriel Elrom, 2026.

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Hepatitis-Hydropericardium Syndrome. Caused by: Fowl Adenovirus (FAdV) Group I, Serotype 4 (FAdV-4);
Severe hydropericardium (clear, straw-colored fluid in the heart sac). Image by Dr. Katriel Elrom, 2026.

Fad4_1.jpg

Hepatitis-Hydropericardium Syndrome. Caused by: Fowl Adenovirus (FAdV) Group I, Serotype 4 (FAdV-4);
Severe hydropericardium (clear, straw-colored fluid in the heart sac). Image by Dr. Katriel Elrom, 2026.