Peer-reviewed veterinary case report
Signs and outcomes of Heterobilharzia americana infection in dogs
By Fabrick, C et al.·Published in Journal of veterinary internal medicine·2010·Department of Small Animal Clinical Sciences, United States·View original on PubMed →
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Original publication title: Clinical features and outcome of Heterobilharzia americana infection in dogs.
- Species:
- dog
Plain-English summary
A group of 22 dogs, mostly younger and larger breeds, were found to be infected with a flatworm called Heterobilharzia americana, which can cause symptoms like lethargy, weight loss, vomiting, and diarrhea. Many of these dogs had high calcium levels that didn't improve without treatment. The main treatments used were praziquantel and fenbendazole, and most dogs that received treatment were still alive 6 months to 3 years later. If your dog shows signs of weight loss or gastrointestinal issues, especially if they’ve been in areas where this infection is common, it’s important to talk to your vet about testing for this parasite.
People also search for: dog weight loss and vomiting · dog lethargy treatment · praziquantel for dogs · dog diarrhea causes · high calcium in dogs
Abstract
BACKGROUND: Heterobilharzia americana (HA), the causative agent of canine schistosomiasis, is a flatworm with a freshwater snail as an intermediate host. Only case reports or small case series evaluating naturally infected dogs have been published. OBJECTIVE: Describe clinical signs in dogs naturally infected with HA. ANIMALS: Twenty-two dogs naturally infected with HA from 1985 to 2009. METHODS: Retrospective study. All medical records were searched for HA and schistosomiasis. Only dogs with a diagnosis based on identification of ova on histopathology or fecal saline sedimentation were included. RESULTS: The median age was 3.1 years (1-12). The median duration of clinical signs before diagnosis was 0.63 months (0.03-12). The most common clinical signs were lethargy (91%), weight loss (77%), hyporexia (68%), vomiting (59%), and diarrhea (55%). Eleven of the 22 dogs were hypercalcemic. Hypercalcemia did not resolve without definitive treatment with praziquantel. HA infection was an incidental diagnosis in 7/22 dogs. Diagnosis was obtained via necropsy (4), histopathology (9), and fecal examination (9). Definitive treatment included praziquantel and fenbendazole. Eighteen dogs were diagnosed antemortem and 17 were treated. Twelve dogs were alive for 6 months to 3 years after diagnosis. CONCLUSIONS AND CLINICAL IMPORTANCE: HA infection occurs in younger, larger breed, indoor dogs. Hypercalcemia does not resolve without praziquantel treatment. Prognosis is good and neither hypercalcemic-induced renal failure nor ascites appears to worsen prognosis. Dogs in affected areas or that have traveled to affected areas that present for weight loss, gastrointestinal or liver disease, and hypercalcemia, should be tested.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/20002553/