Manual of basic techniques for a health laboratory - libdoc.who.int

130 Manual of basic techniques for a health laboratoryEggsNotencapsulatedEncapsulated?Encapsulated(30–40 µm x 25–50 µm)Dipylidium caninumWith orwithoutplugs?Without plugsWith or withoutoperculum?WithoutoperculumWith or withoutspine?With operculumLength of egg?Length120 µmOvoid, thick shell,yellowish brownClearly protruding plugs(50–65 µm x 20–30 µm)Fasciola hepatica(130–145 µm x 70–90 µm)Fasciolopsis buski(125–140 µm x 70–90 µm)Trichuris trichiuraNo clearly protrudingplugs, lemon-shaped(35–45 µm x 20–30 µm)Slightly narrowingin middle?NoCapillaria hepaticaYesCapillaria philippinensisFig. 4.40 Key to the identification of helminth eggs