Romaine lettuce linked to E. Coli outbreak, says CDC

The CDC has issued a warning against consuming romaine lettuce due to potential contamination with E coli strain 0157H7, which has spread across 11 U.S. states and two Canadian provinces. The public is advised to discard any romaine lettuce and sanitize storage areas. Symptoms of infection include diarrhea and kidney failure. To prevent E coli infections, the CDC recommends thorough handwashing, washing fruits and vegetables, and cooking meat properly.

How many states in America have reported cases related to the E. coli outbreak?

What preventive measures does the CDC suggest to avoid E. coli infections?