Which condition involves bloody stools with cysts and trophozoites?

Amebiasis is an intestinal infection caused by the protozoan parasite Entamoeba histolytica. One of the hallmark features of amebiasis is the presence of bloody stools, which can occur due to the ulceration of the intestinal lining as the parasite invades the tissue. This invasion leads to the destruction of colonic tissue, causing dysentery, which is characterized by diarrhea with blood and mucus.

In addition to the clinical presentation of bloody stools, the diagnosis of amebiasis often involves identifying the cysts and trophozoites of Entamoeba histolytica in stool samples. Cysts are the infectious form of the parasite, while trophozoites are the active, motile form that can also be found in the intestines during an active infection. The presence of both forms in the stool is a strong indicator of an amebic infection.

Other conditions listed do not typically present with this combination of symptoms. Gastroenteritis usually presents with diarrhea but is not associated with finding cysts and trophozoites specific to Entamoeba histolytica. Diverticulitis may cause abdominal pain and altered bowel habits but does not lead to bloody stools with cysts or trophozoites as