Final answer:
The most likely causative agent of Michael's tapeworm infection is the pork tapeworm, Taenia solium.
Step-by-step explanation:
The most likely causative agent of Michael's tapeworm infection is Taenia solium (pork tapeworm).
Taenia solium is a tapeworm that can infect humans when contaminated, undercooked pork is consumed. The eggs of Taenia solium hatch in the intestine, and the larvae migrate to various tissues in the body, including the central nervous system. This can cause serious health problems.