Dermatophilosis and abscessation of lymph nodes in a group of TICK-infested horses in Uganda

Shannon, Dylan

doi:10.1007/bf02632328

Cited by 2 publications

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“…Several health and welfare problems including blood loss, pain, irritation, debilitation, mechanical damage, inflammation and hypersensitivity, secondary complication, and decline in productivity and performance in horses of the current study area are possibly associated with the ticks indentified as has been described by Shannon (1997), Jongejan and Uilenberg (2004), and Mekonnen et al (2007). Furthermore, two confirmed cases of equine babesiosis in horses transmitted by R. evertsi evertsi were reported by Pegram et al (1981) in west Shoa and Sidamo areas in Ethiopia.…”

Section: Discussionmentioning

confidence: 72%

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Prevalence and species composition of ixodid ticks infesting horses in three agroecologies in central Oromia, Ethiopia

Kumsa

Tamrat

Tadesse

et al. 2011

Trop Anim Health Prod

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A cross-sectional study was conducted to determine the species composition and prevalence of ixodid ticks infesting horses in three agroecological zones in central Ethiopia. For this purpose, a total of 1,168 horses were examined for tick infestation. An overall prevalence of 39.04% of tick infestation on horses was recorded. A total of 917 adult ticks were collected from infested horses. Amblyomma, Boophilus, Rhipicephalus, and Hyalomma genera with the respective prevalence of 3.2%, 1.8%, 29.2%, and 4.7% were identified. In the study, Rhipicephalus evertsi evertsi was encountered with the highest prevalence (15.8%) whereas Amblyomma gemma was with lowest prevalence (1.5%). From the highland, Hyalomma marginatum rufipes (3.1%), Hyalomma truncatum (1.0%), and Boophilus decoloratus (0.3%) were identified. From the midland, R. evertsi evertsi (27.5%), Rhipicephalus pulchellus (18%), Amblyomma variegatum (3.6%), B. decoloratus (2.8%), H. marginatum rufipes (2.6%), H. truncatum (1.8%), and A. gemma (1.5%) were identified. R. evertsi evertsi, 107 (27.5%), was with the highest prevalence in the midland. From the lowland, R. pulchellus (22.3%), R. evertsi evertsi (20%), H. truncatum (3.6%), A. gemma (3.1%), B. decoloratus (2.3%), H. marginatum rufipes (2.1%), and A. variegatum (1.5%) were identified. In the lowland, R. pulchellus, 87 (22.3%), was the most abundant tick species. The overall prevalence of tick infestation on horses was significantly (P<0.05) higher both in the midland, 225 (57.8%), and the lowland, 214 (54.87%), than the highland, 17 (4.4%). This suggests that horses in midland and lowland are at higher risk of tick infestation than those horses in the highland. Further studies on the role of ticks in transmission of diseases to equines and the importance of horses as alternative hosts in different parts of Ethiopia are needed.

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Section: Discussionmentioning

confidence: 72%

“…They are responsible for a wide range of health problems in horses (Shannon 1997;Wall and Shearer 1997;Jongejan and Uilenberg 2004).…”

Section: Introductionmentioning

confidence: 99%

Prevalence and species composition of ixodid ticks infesting horses in three agroecologies in central Oromia, Ethiopia

Kumsa

Tamrat

Tadesse

et al. 2011

Trop Anim Health Prod

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“…9,10 In a case series reported on horses in Uganda, dermatophilosis and abscessation of lymph nodes were associated with severe tick infestation. 10 However, in the same report from Uganda, many cutaneous lesions were present, and identification of D. congolensis was made solely on the basis of microscopic morphology on a Giemsa-stained cutaneous crust; culture of a lymph node failed to isolate Dermatophilus. The only other report of noncutaneous dermatophilosis in a horse was in an aborted fetus.…”

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confidence: 99%

mentioning

confidence: 99%

“…Although cutaneous D. congolensis infections are not unusual, atypical dermatophilosis, characterized by granulomatous inflammation and localization in tissues other than the epithelium, has rarely been described in horses 9,10 . In a case series reported on horses in Uganda, dermatophilosis and abscessation of lymph nodes were associated with severe tick infestation 10 . However, in the same report from Uganda, many cutaneous lesions were present, and identification of D. congolensis was made solely on the basis of microscopic morphology on a Giemsa-stained cutaneous crust; culture of a lymph node failed to isolate Dermatophilus .…”

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confidence: 99%

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Atypical Dermatophilus Congolensis Infection in a Three-Year-Old Pony

et al. 2010

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Abstract. Dermatophilosis caused by Dermatophilus congolensis causes exudative dermatitis in a variety of species. The infection is generally limited to the cutaneous tissues, where infection is acquired from the environment and bacteria penetrate into keratinized epithelium through epithelial disruption. A 3-year-old pony filly was examined for enlarging mandibular lymph nodes during the preceding 10 months. Biopsy of the node revealed mixed and granulomatous inflammation and thick, filamentous Gram-positive bacteria. Dermatophilus congolensis, confirmed by biochemical testing and sequencing of the ribosomal RNA gene, was cultured from a sample aspirated from the infected site. Dermatophilus congolensis should be considered as a possible etiologic agent associated with lymphadenopathy and granulomatous inflammation in the horse.Key words: Dermatophilosis; Dermatophilus congolensis; horses; lymphadenopathy.Dermatophilus congolensis is a Gram-positive coccobacillary actinomycete that causes an exudative dermatitis in a variety of species, most notably in ruminants and horses, although rare infections occur in cats, dogs, and humans.1,2,12 Infection is generally restricted to the skin and subcutaneous tissue, although uncommon involvement of lymphoid tissue in ruminants and cats has been described. 3,4,12A 3-year-old female palomino pony was referred to the William R. Pritchard Veterinary Teaching Hospital at the University of California, Davis (Davis, CA) with the primary complaint of progressively enlarging bilateral mandibular lymphadenopathy during the previous 10 months. Intermandibular swelling was noticed the winter of the previous year (10 months before referral), and a biopsy of the affected area revealed inflamed lymphoid tissue. Prior to referral, the first premolar teeth had erupted and were removed; significant hooks on cheek teeth were treated with dental floatation. The pony was also reported by the owner to be lethargic and appeared pruritic, as evidenced by biting at or rubbing her sides. The filly had been regularly vaccinated and had most recently been dewormed with pyrantel pamoate 3 weeks prior to referral.The filly was slightly depressed on examination. Her temperature and heart rate were within normal limits. A slightly elevated respiratory rate of 25 breaths per minute was detected, although there were no abnormal lung sounds on thoracic auscultation. Large, firm, nonpainful multilobulated masses in the intermandibular space were palpable. The only other abnormalities on physical examination were small areas of superficial cutaneous excoriations over the flanks, thorax, and gluteal musculature. Dark, loose fecal material was observed after normal defecation.A complete blood count was unremarkable, and plasma fibrinogen was 300 mg/dl. A serum biochemistry panel was within normal limits, with the exceptions of slightly elevated alkaline phosphatase ( A lymph node aspirate and biopsy were performed on the affected tissue; a small amount of inspissated pus was observed during the biopsy procedu...

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Dermatophilosis and abscessation of lymph nodes in a group of TICK-infested horses in Uganda

Cited by 2 publications

References 0 publications

Prevalence and species composition of ixodid ticks infesting horses in three agroecologies in central Oromia, Ethiopia

Prevalence and species composition of ixodid ticks infesting horses in three agroecologies in central Oromia, Ethiopia

Atypical Dermatophilus Congolensis Infection in a Three-Year-Old Pony

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