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Retrospective study of 103 presumed cases of tick (Ixodes holocyclus) envenomation in the horse.
MedLine Citation:
PMID:  22510076     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Objective  Review 103 cases of presumed tick envenomation in horses. Design  Retrospective study. Method  Variables, including date of presentation, age, breed, weight, presence of ticks, gait and respiration scores, duration of recumbency, treatment, outcome and complications were recorded. A series of univariable screening tests were performed and used in a multivariable logistic regression model. Results  There were a total of 103 cases affecting 10 breeds, aged between 1 week and 18 years of age. Horses >6 months old and weighing >100 kg had a higher odds of death than those <6 months old and <100 kg. Cases were seen from North Queensland to the central coast of New South Wales and were more likely to present in the warmer months. There was no association between the number of ticks found on an animal and death. Horses with a higher respiratory score had higher odds of dying, but there was no association between gait score and survival. Horses recumbent >120 h after presentation had higher odds of dying. Complications were reported in 35% of horses. The odds ratio for survival was higher for horses receiving >0.5 mL/kg of tick antiserum. Overall, 74% of horses survived. Multivariable modelling was limited by the small sample size. Conclusion  In general, tick envenomation in horses follows the geographic distribution of Ixodes holocyclus. Tick antiserum administered at >0.5 mL/kg increases the odds of survival. It would appear that the complications associated with managing a recumbent horse increase the odds of death.
Authors:
M Ruppin; S Sullivan; F Condon; N Perkins; L Lee; Lb Jeffcott; Aj Dart
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Australian veterinary journal     Volume:  90     ISSN:  1751-0813     ISO Abbreviation:  Aust. Vet. J.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-04-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370616     Medline TA:  Aust Vet J     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  175-80     Citation Subset:  IM    
Copyright Information:
© 2012 The Authors. Australian Veterinary Journal © 2012 Australian Veterinary Association.
Affiliation:
Research and Clinical Training Unit, Veterinary Teaching Hospital Camden, The University of Sydney, New South Wales, Australia; andrew.dart@sydney.edu.au Oakey Veterinary Hospital, Oakey, Queensland, Australia Tableland Veterinary Service, Malanda, QLD, Australia AusVet Animal Health Services, Toowoomba, QLD, Australia.
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