Romaine lettuce farmers frustrated by government response to E. coli outbreak

The Centers for Disease Control and Prevention told "CBS This Morning" that the risk of new E. coli infections from tainted romaine lettuce is low, but the number of cases will rise. That's because the CDC says older infections will likely be linked to the same strain of bacteria originating in Arizona. So far, 149 people in 29 states have become sick and one person has died.

The FDA has identified one farm in Yuma that supplied the lettuce that made eight prisoners in Alaska sick. That's eight out of 149 cases so far. But tracing the source is like finding one haystack in a thousand acres of land -- then finding the needle buried within it.