Based on new information, CDC is narrowing its warning to consumers. CDC is advising that U.S. consumers not eat and retailers and restaurants not serve or sell any romaine lettuce harvested from the Central Coastal growing regions of northern and central California. If you do not know where the romaine is from, do not eat it. Romaine lettuce products will be labeled with a harvest location by region. It may take some time before these labels are available. If the romaine lettuce is not labeled with a harvest growing region, do not buy, serve, sell, or eat it.