A patient presented with complains of chronic constipation and diarrhoea. There was excessive associated weight loss. Intestinal biopsy was obtained and it showed the following findings. What is your diagnosis?

Ans. (a) Giardiawww.ncbi.nihgov/pubmed/104699(Ref: )This image shows Giardia lamblia infection of the small intestine. The small pear-shaped trophozoites live in the duodenum and become infective cysts that are excreted. They produce a watery diarrhea. A useful test for diagnosis of infectious diarrheas is stool examination for ova and parasites.