Liver Fluke Parasite Poses Growing Threat to Dogs Across the US

The deadly liver fluke parasite, Heterobilharzia americana, has been documented in the Colorado River, marking its spread to the western US and raising concerns for pet and public health.

The liver fluke parasite, Heterobilharzia americana, potentially fatal to dogs, has been found in the Colorado River in Southern California, indicating its spread from the Gulf Coast and South Atlantic regions.
UC Riverside scientists discovered the parasite in two species of snails along the river, marking the first documentation of the parasite this far west in the US.
The parasite causes schistosomiasis in dogs, leading to symptoms such as lethargy, loss of appetite, weight loss, diarrhea, vomiting, and can result in death if untreated.
Public health and veterinary professionals are raising awareness to prevent dogs from swimming in or drinking from the Colorado River to mitigate the risk of infection.
Further research is needed to understand the full extent of the parasite's distribution and its impact on wildlife biodiversity and public health.