"When people get sick, they don't go to the doctor immediately," says Belen Moran, spokesperson for the CDC, which is working with health officials in Texas and elsewhere to track the source of the infection. "And when they do and when they're tested, it takes a few days to get those results back. And if they do have the parasite,Michael Kors Outlet, an epidemiologist will ask them what they ate three weeks ago. So it can be very hard to pinpoint. . We just don't know if the cases are linked."