The main reservoir for Entamoeba histolytica is –
Wait, I think humans are the primary reservoir. Because the life cycle of E. histolytica involves humans passing the cysts in feces, which then infect other humans. But maybe some animals? No, I think it's strictly human. Other options might be other primates, but I'm not sure. Let me check my notes. Oh right, the main reservoir is humans. Other animals aren't typical reservoirs. So the answer is humans. The other options might include things like pigs or other animals, but the key is that humans are the only reservoir. That's a classic point in parasitology. The clinical pearl here is that since humans are the only reservoir, controlling transmission through sanitation and treating infected individuals is crucial.
**Core Concept**
Entamoeba histolytica is an obligate human parasite causing amoebiasis. Its life cycle involves human hosts as the sole reservoir, with transmission occurring via the fecal-oral route through contaminated food or water.
**Why the Correct Answer is Right**
Humans are the primary and only reservoir for *E. histolytica*. The parasite exists in two forms: trophozoites in the intestines and cysts excreted in feces. Cysts survive outside the body and infect new hosts. No other animal hosts are involved, making humans central to its epidemiology.
**Why Each Wrong Option is Incorrect**
**Option A:** Pigs or other animals are not reservoirs—*E. histolytica* does not infect them.
**Option B:** Dogs or cats are not involved in the life cycle.
**Option C:** Mosquitoes transmit diseases like malaria, not amoebiasis.
**Clinical Pearl / High-Yield Fact**
Humans are the **only reservoir** for *E. histolytica*; no zoonotic transmission exists. This makes sanitation and handwashing critical for prevention. Confusion with *E. dispar* (non-pathogenic) is common, but both share the same reservoir.
**Correct Answer: C. Humans**