The outbreak of the dangerous bacteria is over in Canada, but new cases emerged in the US just last week. The number of cases has surpassed 40 and the CDC is waiting to blame a specific plant, though leafy greens are the prime suspect. The CDC and FDA have weathered harsh criticism for their handling of the outbreak. Critics cite slow response time and an inability to ensure that recalls are initiated properly. Contamination is hard to pin down and E. coli can’t be washed from leaves, but it seems best to avoid romaine lettuce for now.