Table 6. The basic frame for the identification of helminth eggs

Ann Clin Microbiol 2024;27:49-67. Practical guide for the diagnosis of helminth ova in stools

Table 6. The basic frame for the identification of helminth eggs

Identification key Group	Size of helminth eggs
Identification key Group	< 40 µm	41~80 µm	> 81 µm
Group I
Embryo (+)	Opisthorchiid, Heterophyid & Gymnophaliid flukes	Dicrocoeliid fluke
Operculum (+)
Group II
Embryo (−)		Diphyllobothriid & Spirometrid tapeworms	Echinostomatid, Paragonimus Neodiplostomum, Fasciola spp. Fasciolopsis
Group III
Embryo (+)		Cyclophyllidean tapeworm*	Schistosoma spp.
Operculum (−)
Group IV
Embryo (−)		Nematodes^†	Nametodes^‡

^*Taenia spp. and Hymenolepis spp.; ^†Ascaris lumbricoides (F), Trichuris trichiura and hookworms; ^‡Ascaris lumbricoides (U) and Trichostrongylus orientalis.