Document Detail


Possible acquired resistance of dogs successively infested by Amblyomma cajennense (Fabricius, 1787) (Acari: Ixodidae) nymphs.
MedLine Citation:
PMID:  20040189     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
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:
Type:  Journal Article    
Journal Detail:
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:
Created Date:  2009-12-30     Completed Date:  2010-07-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9440482     Medline TA:  Rev Bras Parasitol Vet     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  40-2     Citation Subset:  IM    
Affiliation:
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:
Adaptive Immunity*
Animals
Dog Diseases / immunology*
Dogs
Ixodidae*
Nymph
Tick Infestations / immunology,  veterinary*

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