What is a hallmark pathological finding associated with bacillary hemoglobinuria in cattle?

What is a hallmark pathological finding associated with bacillary hemoglobinuria in cattle?

• A. Hemoglobinuria and hepatic infarct
• B. Diarrhea and dehydration
• C. Pulmonary edema
• D. Renal failure

Answer: (A)

The main idea is that bacillary hemoglobinuria in cattle is defined by intravascular hemolysis causing hemoglobin in the urine, together with hepatic infarcts from toxin-mediated liver necrosis. Clostridium haemolyticum produces toxins that destroy red blood cells and damage liver tissue, so you see dark, hemoglobin-rich urine and focal hepatic necrosis (infarcts). This combination—hemoglobinuria plus hepatic infarcts—is the characteristic finding. Other options don’t reflect this hallmark. Diarrhea and dehydration are more typical of enteric diseases; pulmonary edema isn’t a feature of bacillary hemoglobinuria; renal failure can occur as a consequence of hemoglobinuric processes but isn’t the defining lesion.

The main idea is that bacillary hemoglobinuria in cattle is defined by intravascular hemolysis causing hemoglobin in the urine, together with hepatic infarcts from toxin-mediated liver necrosis. Clostridium haemolyticum produces toxins that destroy red blood cells and damage liver tissue, so you see dark, hemoglobin-rich urine and focal hepatic necrosis (infarcts). This combination—hemoglobinuria plus hepatic infarcts—is the characteristic finding.

Other options don’t reflect this hallmark. Diarrhea and dehydration are more typical of enteric diseases; pulmonary edema isn’t a feature of bacillary hemoglobinuria; renal failure can occur as a consequence of hemoglobinuric processes but isn’t the defining lesion.