Unique Zika case remains medical mystery

SALT LAKE CITY - A case of the Zika virus in Utah is now the only one in the continental U.S. that’s still puzzling researchers on exactly how it spread, health officials said Tuesday.The man caught the illness after caring for his infected father, who had an extremely high level of the virus in his blood when he died in June, according to a report released by the U.S. Centers for Disease Control and Prevention. One possibility is that he transmitted the virus to his son through a bodily f