Southern Californians have been warned that more than 90 percent of popular game fish have been found to contain invasive, parasitic worms that can infect humans.

Two species of the parasitic flatworms known as "trematodes" were found infecting five species of freshwater fish from San Diego County in a study by researchers from University of California , San Diego's Scripps Institution of Oceanography.

Infection with the worms typically causes gastrointestinal problems, lethargy and weight loss in humans—but severe cases have even been known to cause heart attack and strokes.

"Americans don't usually think about parasites when they eat freshwater fish because it hasn't historically been an issue here," said paper author and ecologist Ryan Hechinger in a statement.

However, he a

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