author(s)
Dr. A Arulmozhi, Dr. M Sasikala, Dr. P Anbarasi, Dr. P Sumitha and Dr. GA Balasubramaniam

abstract
A Holstein Friesian cross bred dairy cow was brought to Veterinary College and Research Institute hospital with the history of severe watery diarrhoea and bloat. Blood and serum samples of the animal revealed severe anaemia, hyponatremia and hypokalemia. In spite of the treatment, the animal died on the same day. The carcass was referred to Department of Veterinary Pathology for post-mortem examination. Grossly, there were ecchymotic haemorrhage in epicardium, marbling of lungs due to severe edema and fully packed rumen with whitish flukes. The gravid uterus contained five months old female foetus and ecchymotic haemorrhage seen over neck and thigh regions of the foetus. The heart blood and lung swabs of both dam and foetus were positive for Pasteurella multocida and were further confirmed by biochemical tests. The worms collected from the rumen were identified as immature amphistomes based on the morphometry and morphological characters. Histopathologically, severe edema in the inter alveolar and inter lobular septa of lungs, portal fibrosis, bile duct hyperplasia and necrosis of hepatocytes were noticed.