What parasite ova have three pairs of hooklets?

What parasite ova have three pairs of hooklets?

• A. Trichuris vulpis
• B. Moniezia species
• C. Taenia species
• D. Alaria species

Answer: (B)

Understanding what the oncosphere looks like inside the egg is key. In cestode eggs, the larval stage inside is the oncosphere, which bears six hooks arranged as three pairs. This three-pair hooklet pattern is a classic feature used to identify Moniezia eggs in diagnostic exams. That distinctive trait is what sets Moniezia apart from the others listed: Trichuris vulpis eggs are barrel-shaped with polar plugs and lack hooklets; Alaria eggs are trematode eggs with an operculum; Taenia eggs also have six hooks, but the three-pair hooklet description is the hallmark associated with Moniezia in these questions. So, the egg with three pairs of hooklets points to Moniezia species.

Understanding what the oncosphere looks like inside the egg is key. In cestode eggs, the larval stage inside is the oncosphere, which bears six hooks arranged as three pairs. This three-pair hooklet pattern is a classic feature used to identify Moniezia eggs in diagnostic exams. That distinctive trait is what sets Moniezia apart from the others listed: Trichuris vulpis eggs are barrel-shaped with polar plugs and lack hooklets; Alaria eggs are trematode eggs with an operculum; Taenia eggs also have six hooks, but the three-pair hooklet description is the hallmark associated with Moniezia in these questions. So, the egg with three pairs of hooklets points to Moniezia species.