Ileana, a high-ranking US government official, recently traveled to the Near East on a diplomatic mission. During a formal reception, she ate some delicious steak tartare (raw beef), a traditional dish in that region. However, 3 months later, she noticed thin white rectangular segments in her stool. She experienced nausea, in part from the pathogen and in part from the sight of it in her stool. What pathogen do you suspect