| Possible acquired resistance of dogs successively infested by Amblyomma cajennense (Fabricius, 1787) (Acari: Ixodidae) nymphs. | |
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MedLine Citation:
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PMID: 20040189 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The present study aimed to evaluate the occurrence of immune resistance in dogs successively infested with Amblyomma cajennense nymphs. Five animals were submitted to four consecutive infestations with A. cajennense nymphs, at fourteen-day intervals. For each infestation, 50 nymphs were used per animal and data on the parasitic and non-parasitic periods were recorded. The average recovering rate of engorged nymphs in the successive infestations were 52.0, 29.2, 9.6 and 12.8%, respectively, with a significant reduction (p<0.05) of this parameter from the second infestation onwards. The modal drop-off day of engorged nymphs was Day 4 of parasitism in all infestations. The average mortality rates of nymphs seen on the first, second, third and fourth infestations were 3.6, 3.2, 2.0 and 2.8%, respectively, with no significant differences among them (p<0.05). In addition, no significant differences were seen among the ecdysis rates for specimens recovered from successive parasitic challenges. The study results suggest that the acquired resistance of infested dogs had a negative effect on recovery rate of A. cajennense nymphs; however, it did not affect the other biological parameters evaluated. |
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Authors:
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Carolina Maria Vianna de Freitas; Romário Cerqueira Leite; Eduardo Bastianetto; Arildo Pinto da Cunha; Ana Cristina Passos de Paiva Belo |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária Volume: 18 Suppl 1 ISSN: 0103-846X ISO Abbreviation: Rev Bras Parasitol Vet Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2009-12-30 Completed Date: 2010-07-06 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9440482 Medline TA: Rev Bras Parasitol Vet Country: Brazil |
Other Details:
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Languages: eng Pagination: 40-2 Citation Subset: IM |
Affiliation:
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Laboratório de Ectoparasitoses, Escola de Veterinária-EV, Universidade Federal de Minas Gerais-UFMG, Av. Antônio Carlos 6627, CEP 30161-970 Belo Horizonte-MG, Brazil. |
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| MeSH Terms | |
Descriptor/Qualifier:
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Adaptive Immunity* Animals Dog Diseases / immunology* Dogs Ixodidae* Nymph Tick Infestations / immunology, veterinary* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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