Page 168 - The Veterinary Laboratory and Field Manual 3rd Edition

Parasitology 137

Figure 3.19 The relative size of helminth ova, coccidial oocysts and artefacts. (A) Nematodirus sp., (B)
Cooperia sp., (C) Capillaria sp., (D) Ascaris sp., (E) Trichuris sp., (F) Chabertia sp. (strongyle type), (G) mite
egg, (H) Moniezia sp. (tapeworm), (I) free-living nematode ova, (J) coccidial oocyst, (K) yeast. It is com-
mon to see larvae in specimens which have not been examined soon after collection and not preserved
or stored in the fridge. Some larvae may be free-living species, identification of helminth larvae and inter-
pretation of results takes some skill and experience. To avoid larvae hatching make sure that samples are
collected and stored correctly. Illustration: Louis Wood. See also Plates 2a, 2b, 3 and 4.

(a) (b)

(c)

Figure 3.20 (a) The microscopic appearance of parasite eggs commonly found in the faeces of carnivores.
(A) Toxocara sp., (B) Ancylostoma sp., (C) Uncinaria sp., (D) Trichuris sp., (E) Capillaria sp. (Capillaria plica
may be found in the urine), (F) tapeworms (eggs, but may also see segments), for example, Taenia sp.
and Echinococcus sp., (G) Dipylidium caninum. (b and c) Photomicrographs (40×) of the canine hookworm
(Ancylostoma caninum) demonstrating the structure of the nematode mouth parts and the gut. Photo:
Stephano Catalano, University of Calgary, Canada. See also Plates 2a, 2b, 3 and 4.

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