More than 250 species of Capillaria have been described in mammals, birds, reptiles and amphibians (Cross, 1992), although only four species have been associated with human infection: C. hepatica, C. aerophila, C. plica and C. philippinensis. Of these, only C. philippinensis is a regular human pathogen, and has been associated with large-scale epidemics. The adult males are 1.5-3.9 mm long and the females longer, 2.3-5.3 mm. The male has a long spicule (230300 pm), with the spicular sheath extending up to 440 pm. The eggs exhibit a characteristic peanut shape with small bipolar plugs (Cross, 1992).
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