Parasitological Survey of the NileRat Arvicanthis Niloticus (Desmarest, 1822) Lesson,1842 (Mammalia, Muridae) In Some RuralAnd Urban Regions of Sudan

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Fagir, Dina Mustafa
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During the period January 2003-January 2006, a total of (220) Nile Rats Arvicanthis niloticus (Desmarest, 1822) Lesson, 1842 (Mammalia, Muridae) were collected from different locations: Khartoum State -151 (Geraif West, 45; Shambat, 19; Soba, 26; Halfayia, 36 and Droshab, 25). Tuti Island - 27. Sabaloka Cataract - 31. Duiem Town - 11. The aim of this study was to define the morphological description, prevalence and intensity of infestation of endo- and ecto-parasites of the Nile rat in the Sudan. Also the study aimed to correlate these findings with the habitat of the rat. In addition, age and sex related infection or infestation was considered. Investigations of the alimentary canal and heart revealed that 70% of rats dissected were infected with one or more of these helminths: Cestodes: Hymenolepis nana, Hymenolepis diminuta, Unidentified Hymenolepididae, Raillietina sp. (I), Raillietina sp. (II). Nematodes: Monanema nilotica, Streptopharagus sp. Histological sections from parasitized organs namely heart, liver and small intestine were prepared. No distortion of cells was detected. Blood, bone marrow and faecal smears were examined for protozoan parasites. Impression smears were also made from liver. Faecal examination, using floatation method, revealed no protozoan parasites. Results revealed that 93.2% of rats were infected by one species or more of either ecto- or endo-parasites. Investigation of skin revealed that 83.8% of rats were infested with one or more of ectoparasites namely insects and arachnids, plus 28 non-identified samples of mites and ticks. Species or genera identified: Insects: Xenopsylla cheopis, Polyplax spinulosa, Polyplax abyssinica, Polyplax serrata, Lipeurus spp. Arachnids: Trombicula sp., Dermanyssuss sp (I), Dermanyssuss sp. (II), Dermanyssuss gallinae, Ornithonyssus bacoti, Laelaps sp., Rhipicephalus sp
Parasitological,Survey ,NileRat Arvicanthis Niloticus,Sudan