The pathogen Giardia duodenalis is present in mussels from freshwater run-off sites and from areas where California Sea Lions lounge along the coast of California, according to a team of researchers. One of the G. duodenalis strains found is known to infect humans; the two others occur mostly in dogs and other canids. 'Thus, the detection of these assemblages implies a potential public health risk if consuming fecally contaminated water or uncooked shellfish,' says a coauthor....