Helminth and arthropod parasites were collected from 41 warthogs, Phacochoerus aethiopicus, in the Hoedspruit Nature Reserve, eastern Transvaal. This reserve consists of a military base, which is a restricted area and is surrounded by a reserve, which is open to the public. Eleven nematode species, 1 or 2 cestode species and the larvae of 2 cestode species were recovered from the animals in the reserve, and 8 nematode species and 1 or 2 cestode species were recovered from those in the military base. Oesophagostomum spp. were generally most abundant in warthogs in the reserve during the cooler months of the year, while Probstmayria vivipara also occurred in peak numbers during the cooler months, with an additional peak in October and November 1988 in warthogs in the reserve and the base, respectively. No pattern of seasonal abundance could be determined for the other helminth species. The warthogs also harboured 8 ixodid and 1 argasid tick species, 3 flea species and 1 louse species. Adult and immature Haematopinus phacochoeri were most numerous during August and September, and the largest numbers of adult Rhipicephalus simus were present from December to April.
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