Pathology Pathological changes occur in dengue haemorrhagic Fever ( DHF): A Focal haemorrhages and congestion. B Coagulopathy with thrombocytopenia. C Haemoconcentration. D All of the above. 💡 Explanation Pathological changes occur in dengue haemorrhagic Fever ( DHF): ✓ Correct Answer: D. All of the above.