Wildlife Disease Study

Transcription

1 Ectoparasite of White-tailed tailed Deer mrsmaine.wikispaces.com Andrew N. Cartoceti DVM Southeastern Cooperative Wildlife Disease Study

2 History/Signalment White-tailed tailed deer (Odocoileus virginianus) Southern TN in late December/early January Reports of Cheetos staining on face Otherwise healthy Ears and skin of the face submitted

3 Gross Lesions Fine, orange, granular material Skin roughened and crusting Alopecia i Around muzzle, eyes and ears most affected

4 Gross Lesions

5 Gross Lesions

6 Gross Lesions

7 A Closer Look Orange Oange Round-bodied Six legs (larval stage) Piercing mouthparts Neotrombicula microti Neotrombicula sp. 52 um Little et al, 2007

8 Histopathology Many mites attached to surface of epidermis by mouthparts

9 Mite Morphology Thin exoskeleton Piercing mouthparts (chelicerae) (hl GI tract Striated skeletal muscle Linear feeding tracts

10 Histopathology Tissue reaction Acanthosis and epidermal necrosis Eosinophils, lymphocytes, plasma cells, macrophages and others in dermis Dermal necrosis around feeding tracts

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13 Trombiculidae Engorged larva Unfed larva Nymph Adult Egg Larvae feed < 1 week Nymph y p and adults are soil micropredators

14 Feeding Trombidium newelii Mohamed and Hogg, 2004

15 To help protect your privacy, PowerPoint prevented this external picture from being automatically downloaded. To download and display this picture, click Options in the Message Bar, and then click Enable external content. Likely Genera Eutrombicula spp. Common in Southeast Light infestation No clinical signs or lesions Year-roundround Neotrombicula spp. Less common Heavy infestation Pruritis and grossly apparent dermatitis Winter predilection i Neotrombicula autumnalis

16 Disease Impacts Typically none Heavy infestation may produce crusting, alopecia and pruritis Debilitation uncommon Rare death in young sheep and albatross chicks Vector for scrub typhus in East Asia and South Pacific

17 References Forrester DJ, McLaughlin GS, Telford SR, Foster GW, McCown JW: Ectoparasites (Acari, Mallophaga, Anoplura, Diptera) of white-tailed tailed deer, Odocoileus virginianus,, from southern Florida. J Med Ent 33: , 1996 Little SE, Carmichael KP, Rakich PM: Trombidiosis-induced induced dermatitis in white-tailed tailed deer (Odocoileus virginianu). Vet Pathol 34: , 352, 1997 Mohamed AMA, Hogg DB: The attachment and stylostome of Trombidium newelli (Acari: Trombidiidae), an ectoparasitic mite on adult alfalfa weevil, Hypera postica (Coleoptera: Curculionidae). Exp and Applied Acarology 34: , 333, 2004 Rohani IB, Cromroy HL: Toxonomy and distribution of chiggers (Acarina: Trombiculidae) in northcentral Florida. Fl Entom 62: , 376, 1979 Sweatman GK: Mites and pentastome. In: : Parasitic Diseases of Wild Mammals, ed. Davis JW and Anderson RC, pp Iowa State University Press, Ames, IA, 1971 Tatsuo H, Roberts LW, Hildebrandt PK and Cavanaugh DC: Stylostome formation by Leptotrombidium mites (Acari: Trombiculidae). J Parisitol 64(4) , 719, 1978

18 Questions Trombidium holosericeum Luc Viatour