**Core Concept**
Schistosomiasis, a parasitic disease caused by Schistosoma species, is a classic example of a meta-zoonotic infection. This is because the parasite's life cycle involves two intermediate hosts: a snail (freshwater snails of the genus Bulinus) and a mammalian host (humans). The parasite undergoes asexual reproduction within the snail host, and then sexual reproduction occurs in the mammalian host.

**Why the Correct Answer is Right**
Schistosomiasis is a meta-zoonotic infection because it requires two intermediate hosts to complete its life cycle. The parasite's cercariae stage is released from the snail host and infects the mammalian host, where it undergoes further development and reproduction. This unique life cycle is characteristic of meta-zoonotic infections, which involve multiple intermediate hosts. The parasite's ability to infect and reproduce within multiple hosts is a key factor in the transmission and epidemiology of schistosomiasis.

**Why Each Wrong Option is Incorrect**
**Option B:** Cyclo-zoonoses involve a single intermediate host that undergoes a cycle of reproduction, which is not the case in schistosomiasis. The snail host in schistosomiasis is not a cyclo-zoonotic host, but rather an intermediate host that allows the parasite to complete its life cycle.
**Option C:** Direct-zoonoses involve the direct transmission of a pathogen from an animal host to a human host, without an intermediate host. Schistosomiasis does not fit this definition, as it requires an intermediate snail host.
**Option D:** Sporo-zoonoses typically involve the transmission of spores from an animal host to a human host, often through contaminated food or water. Schistosomiasis is not a sporo-zoonotic infection, as it involves a complex life cycle with multiple intermediate hosts.

**Clinical Pearl / High-Yield Fact**
The snail host plays a critical role in the transmission of schistosomiasis, and controlling the snail population is an essential component of schistosomiasis prevention and control programs. Understanding the life cycle of the parasite is crucial for developing effective control measures.

**✓ Correct Answer: A. Meta-zoonoses**