The role of ear mites of the genus Raillietia (Acari: Raillietiidae) in otitis of domestic ruminants

Ferry, Fernando Raphael Almeida; Faccini, João Luíz Horácio; Inada, T.

doi:10.1590/s0100-736x2011001100007

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…Furthermore, mite penetration into the epithelium was not observed, most likely because this parasite does not have a digging habit, because P. cuniculi has a short gnathosoma and the chelicera are not adapted to cut the host's skin (SWEATMANN, 1958). The presence of P. cuniculi adhering to exudate and cerumen in the ear canal suggests a mechanical lesion, different from the lesions caused by Raillietia auris in bovines, which causes a traumatic lesion and may perforate the epithelium with the tarsus' clutches during fixation or with the gnathosoma's chelicera during feeding (FERRY;INADA, 2011). In this study, the absence of eosinophils in the histological lesions of most of the animals, suggests that there is not a hypersensitivity reaction occurring.…”

Section: Introductionmentioning

confidence: 49%

Histopathological alterations in psoroptic mange caused by Psoroptes cuniculi (Delafond, 1859) in goats

Dantas¹,

Riet-Correa²

2015

Sem. Ci. Agr.

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With the aim to study the histologic lesions caused by Psoroptes cuniculi, the ears of 15 adult goats were collected in a slaughter house in the city of Patos, state of Paraíba, in the Brazilian semiarid region. Five goats had crusts and exudates in the external ears and were infested by 21 to 189 mites in each ear. Another 10 goats were asymptomatic, five of which had 14 to 39 mites and five of which were non-infested. From the five goats with clinical signs, three presented moderate macroscopic lesions with cerumen and dry crusts in both ears, affecting the pinna and ear canal. Two other goats presented mild lesions, characterized by exudates in the pinna without crust formation. The histologic lesions included varying degrees of parakeratotic hyperkeratosis, orthokeratotic hyperkeratosis, acanthosis, hypergranulosis, spongiosis, and dermatitis, with rare eosinophils. P. cuniculi were observed in the ear canal, occasionally in contact with the stratum corneum, but without causing traumatic lesions in the epithelium, which suggests that the lesions occur through a mechanical effect due to the presence of the mites together with the exudates, cerumen, and keratin residues. Key words: Goats, Psoroptes cuniculi, otoacariasis ResumoCom o objetivo de estudar as lesões histológicas causadas por Psoroptes cuniculi, as orelhas de 15 caprinos adultos foram coletadas em um abatedouro da cidade de Patos, na região semiárida da Paraíba. Cinco caprinos apresentavam crostas e exsudato nas orelhas externas e estavam infectados por 21 a 189 P. cuniculi em cada orelha. Outros 10 caprinos eram assintomáticos; destes, cinco eram infectados com 14 a 39 ácaros e cinco não estavam infectados. Dos cinco caprinos com sinais clínicos, três apresentavam lesões macroscópicas moderadas com cerume e crostas secas no pavilhão auditivo e conduto auditivo externo. Outros dois caprinos apresentavam lesões leves com exsudato no pavilhão auditivo, sem crostas. Às lesões histológicas incluíram vários graus de hyperqueratose paraqueratótica, hyperqueratose ortoqueratótica, acantose, hypergranulose, espongiose, e dermatite, com raros eosinófilos. P. cuniculi foi observado no canal auditivo, ocasionalmente em contato com o estrato córneo, mas sem causar lesões traumáticas no epitélio, sugerindo que as lesões ocorrem por efeito mecânico devido à presença de ácaros junto com exsudato, cerume e resíduos de queratina.

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Section: Introductionmentioning

confidence: 49%

Histopathological alterations in psoroptic mange caused by Psoroptes cuniculi (Delafond, 1859) in goats

Dantas¹,

Riet-Correa²

2015

Sem. Ci. Agr.

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“…only feeds on the cerumen and cell debris; however, its presence may result in areas of erosion in addition to an intense irritation of the EAC with inflammatory lesions, such as edema, a local temperature increase and secretions (Nunes et al 1980, Ferry et al 2011, which favor the survival and multiplication of the nematode Rhabditis.…”

Section: Discussionmentioning

confidence: 99%

Clinical aspects and dynamics of auricular parasitosis in Gir cattle

Leite

Cunha

et al. 2013

Pesq. Vet. Bras.

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Pesq. Vet. Bras. 33(3):319-325, março 2013 319 RESUMO.-[Aspectos clínicos e dinâmica de parasitoses auriculares em bovinos da raça Gir.] Avaliou-se a dinâ-mica da infestação auricular causada por Rhabditis spp. e por Raillietia spp., relacionando-a com a idade dos animais, com a intensidade dos sinais clínicos e com os fatores climáticos. Utilizaram-se 64 bovinos Gir, distribuídos em três grupos: GA -23 bezerros de quatro a seis meses de idade, GB -18 bezerros de sete a 12 meses e GC -23 novilhas de 13 a 33 meses. Foram feitas cinco coletas a cada três meses. A secreção auricular foi coletada utilizando o método de lavagem auricular na orelha direita e um swab na orelha esquerda. Sixty-four Gir cattle were distributed into three groups: GA -23 calves with 4 to 6 months of age; GB -18 calves with 7 to 12 months of age; and GC -23 heifers with 13 to 33 months of age. Five samplings, defined as S1, S2, S3, S4 and S5 were performed every three months from August 2008 to August 2009. The ear secretion was collected using the auricular washing method for the right ear and a swab for the left ear. A clinical assessment of the animals was performed, and they were classified according to the presence and severity of otitis. The highest relative frequency of rhabditosis was 52.2% in GC at the last sampling. In the first sampling, 42.2% of the animals were infested by Raillietia spp. The older cattle were more susceptible to infestations by both parasites. No correlation of Rhabditis spp. and Raillietia spp. parasitism with climate factors was found. The results showed that both parasites could infest Gir cattle, and in most cases, there was no co-infestation. Only older animals parasitized by the nematode showed clinical signs of the disease. maior frequência relativa da rhabditiose encontrada foi de 52,2%, no GC na ultima coleta. Na primeira coleta, 42,2% dos animais estavam infestados pela Raillietia spp. Os bovinos mais velhos foram mais suscetíveis às infestações de ambos os parasitos. Não foi encontrada correlação entre o parasitismo por Rhabditis spp. e por Raillietia spp. e os fatores climáticos. Concluiu-se que ambos os parasitas podem infestar bovinos da raça Gir e na maioria dos casos, não ocorreram infestações simultâneas. Apenas os animais mais velhos, parasitados pelo nematóide, apresentaram sinais clínicos da doença.

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Pilot Study: Occurrence of Ear Mites and the Otic Flora in Domestic Ruminants on St. Kitts

Navarro

Wahlen

Streiff

et al. 2017

Veterinary Parasitology: Regional Studies and Reports

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The role of ear mites of the genus Raillietia (Acari: Raillietiidae) in otitis of domestic ruminants

Cited by 4 publications

References 9 publications

Histopathological alterations in psoroptic mange caused by Psoroptes cuniculi (Delafond, 1859) in goats

Histopathological alterations in psoroptic mange caused by Psoroptes cuniculi (Delafond, 1859) in goats

Clinical aspects and dynamics of auricular parasitosis in Gir cattle

Pilot Study: Occurrence of Ear Mites and the Otic Flora in Domestic Ruminants on St. Kitts

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