Fatal systemic toxoplasmosis reported in an adult alpaca
CURRENT BRIEF VERSION: A newly reported pathology case describes what appears to be the first published fatal case of systemic toxoplasmosis in an adult alpaca. The case, published in the Journal of Veterinary Diagnostic Investigation, involved an 11-year-old female alpaca submitted for necropsy after three days of sternal recumbency. Gross findings included hydrothorax, ascites, hepatomegaly, fibrinous pleuritis, cranioventral bronchopneumonia, pulmonary atelectasis, and firm thoracic and abdominal adipose tissue. Histopathology identified chronic lymphocytic and histiocytic hepatitis with necrosis and bridging fibrosis, thrombosis in adipose tissue, fibrinosuppurative pleuritis, pyogranulomatous pneumonia, and ulcerative gastritis, with Toxoplasma gondii confirmed in inflamed tissues by immunohistochemistry. A predisposing cause was not identified. (eurekamag.com)
Why it matters: For veterinary professionals, the case is a reminder that although T. gondii exposure in camelids appears to occur, overt clinical disease is rare, especially in adults. Prior literature has documented T. gondii isolation from alpacas, toxoplasmosis-associated abortion in an alpaca fetus, and acute fatal systemic toxoplasmosis in a young llama, but not a confirmed fatal systemic case in an adult alpaca. It also lands in a species where baseline anatomic reference data are still being built out, including newer imaging descriptions of normal alpaca sinonasal anatomy that may help clinicians better interpret head imaging when working through differentials for respiratory or multisystemic disease. That makes this report clinically useful for differential diagnosis in adult camelids with recumbency, multisystemic disease, pneumonia, hepatitis, serositis, or unexplained necrotizing lesions at necropsy. (pubmed.ncbi.nlm.nih.gov)
What to watch: Watch for whether this case prompts more discussion around ante-mortem testing, herd-level exposure management, and the role of concurrent immunosuppression or other predisposing factors in adult camelid toxoplasmosis. More broadly, expect continued efforts to strengthen normal alpaca imaging references—CT and MRI work has shown that alpacas consistently have conchal, maxillary, frontal, and ethmoidal sinuses, often a sphenoidal sinus, sometimes bilateral lacrimal sinuses, and notably lack ventral conchal and palatine sinuses—which can improve confidence when evaluating camelid head disease. (acvp.org)