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Trichinella Infected 60% of Golden Jackals and 79% of Red Foxes in Western Romania

Golden jackal and red fox interacting in woodland
Research · Disease, parasites & microbiology

Trichinella larvae were detected in 60.4% of sampled golden jackals (Canis aureus) and 78.9% of red foxes (Vulpes vulpes) in western Romania, according to a study published on 8 April 2026. The researchers examined 134 wild canids collected between August 2025 and January 2026 and also measured antibodies that neutralise rabies virus.

Trichinella are zoonotic parasitic nematodes whose larvae persist in muscle tissue. Wild carnivores can help maintain the parasites in the sylvatic cycle, so high prevalence in jackals and foxes indicates substantial circulation in the wildlife community rather than merely isolated infections.

The sample consisted of 96 golden jackals and 38 red foxes taken legally under Romania’s annual hunting quotas. Muscle tissue was tested for Trichinella larvae, while blood serum was used to measure rabies virus-neutralising antibodies. The study treated 0.5 IU/mL as the threshold for a protective antibody response.

Trichinella was common in both species

Trichinella was found in 58 of 96 golden jackals and 30 of 38 red foxes. The resulting prevalence estimates were 60.4% and 78.9%, respectively, showing a higher infection prevalence in red foxes than in golden jackals.

Among golden jackals, infection prevalence also differed among the biological categories examined. It was highest in adult males at 72.7%, compared with 48.1% in juveniles and 35.7% in adult females. The researchers nevertheless found broadly similar larval burdens between infected jackals and foxes.

More than half were below the rabies-antibody threshold

Rabies serology showed substantial variation within both species. Among golden jackals, 47.9% had antibody levels at or above 0.5 IU/mL, while 49.0% were below that threshold and another 3.1% had undetectable levels. In red foxes, 42.1% were at or above the threshold, 55.3% were below it and 2.6% had undetectable levels.

The antibody test measures an immune response to rabies virus; it is not a test for active rabies infection. The authors interpret the large share of animals below the protective threshold as evidence of uneven population immunity and possible gaps in wildlife rabies control. The overall distribution across the antibody categories did not differ clearly between jackals and foxes.

Both Trichinella and rabies remain relevant zoonotic diseases in Romania, and the expanding golden jackal increasingly shares landscapes with red foxes, domestic animals and people. The authors argue that disease surveillance should therefore include golden jackals alongside the better-established red fox monitoring.

Sources and image credit

  1. Tripon, M. R., Gaspar, C. M., Pătrînjan, R. T., Knop, R., Marinaș, R. C., Boja, F. C., Huiban, F. A., Șerban, C. D., & Tulcan, C. (2026). Integrated surveillance of Trichinella spp. and rabies virus-neutralising antibodies in golden jackals (Canis aureus) and red foxes (Vulpes vulpes) from Western Romania. Animals, 16(8), 1135.Primary open-access study published 8 April 2026 under CC BY 4.0. The study analysed 96 golden jackals and 38 red foxes collected from August 2025 to January 2026.

Image: Felix Böcker, Hannah Weber, Janosch Arnold, Sebastian Collet & Jennifer Hatlauf — golden jackal and red fox socially interacting in Baden-Württemberg, Germany, 21 June 2021; representative image, not the Romanian study animals. Source: Wikimedia Commons. · CC BY 4.0 · Source

About this content: This story was produced with AI assistance within an editorial workflow developed by Wildlife Vagabond. Editorial responsibility remains with Wildlife Vagabond.How AI is used

Disease, parasites & microbiology

SPECIES IN THIS STORY

Species in this story

Golden Jackal Canis aureus Explore species Red Fox Vulpes vulpes Explore species

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