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Deadly Parasite for Animals Found in Southern California’s Colorado River

A recent study conducted by the University of California, Riverside has unveiled a potentially lethal parasite lurking in the waters of the Colorado River in Southern California. Identified as Heterobilharzia americana, this parasite, commonly known as a liver fluke, poses a significant risk to dogs and potentially other mammals.

Historically confined to regions along the Gulf Coast and South Atlantic of North America, Heterobilharzia americana has now expanded its territory, making its first appearance in the Colorado River, a popular spot for recreational activities for both humans and their four-legged companions. This flatworm, once primarily found in Texas and neighboring Gulf states, has extended its reach westward, causing alarm among researchers.

The study, led by UC Riverside nematology professor Adler Dillman, sheds light on the parasite’s presence in the Colorado River, particularly around Blythe, California, near the Arizona border. After several dogs tested positive for the parasite following swims in these waters, researchers collected and examined over 2,000 snails along the riverbanks. Their findings not only confirmed the parasite’s presence but also highlighted a broader distribution than previously acknowledged.

Dillman said, “Dogs can die from this infection, so we are hoping to raise public awareness that it’s there. If you’re swimming in the Colorado River with them, your pets are in peril”

The lifecycle of this parasite is particularly insidious. Upon entering a host, typically through the skin, it migrates to the lungs, causing hemorrhaging. Subsequently, it settles in the veins of the intestinal lining to mature and reproduce. However, it’s not the presence of the adults in the veins that poses the greatest threat; rather, it’s the eggs that migrate to vital organs such as the lungs, spleen, liver, and heart, wreaking havoc on the host’s immune system and impeding organ function.

The implications of this discovery extend beyond veterinary concerns. With documented cases of Heterobilharzia americana infecting various mammalian species, including raccoons, horses, and bobcats, the parasite poses a broader threat to biodiversity and public health. Symptoms in dogs can be subtle initially, including loss of appetite, eventually progressing to vomiting, diarrhea, weight loss, and signs of liver disease. Timely diagnosis and treatment are crucial, as the parasite can be fatal if left unchecked.