Which two helminth eggs may resemble each other?

The two helminth eggs that may resemble each other are those from Diphyllobothrium latum and Paragonimus westermani. Both of these parasites produce eggs that can be oval in shape and contain opercula, which can confuse identification under the microscope.

Diphyllobothrium latum, commonly known as the broad fish tapeworm, has eggs that are typically operculated and characterized by a unique appearance that can sometimes overlap with those of Paragonimus westermani, the lung fluke. Paragonimus westermani's eggs are similarly operculated and exhibit a somewhat similar size and shape to those of Diphyllobothrium latum, leading to challenges in distinguishing them without further identification methods.

On the other hand, the eggs produced by Opisthorchis sinensis and Fasciolopsis buski are generally distinct, mainly due to differences in size, shape, and surface features. Similarly, the eggs of Taenia saginata and Hymenolepis nana, while both are tapeworms, present with distinct morphological characteristics that allow for easier differentiation. Furthermore, the eggs of Ascaris lumbricoides and Trichostrongylus, while they may share