The Centers for Disease Control and Prevention has issued a Food Safety Alert regarding a multi-state outbreak of E. coli infections that are linked to Romaine lettuce from the area of Salinas, California.

Here's more information from the CDC website:

Based on new information, CDC is advising that consumers not eat and retailers not sell any romaine lettuce harvested from the Salinas, California growing region.

Most romaine lettuce products are labeled with a harvest location showing where they were grown.
This advice includes all types of romaine lettuce harvested from Salinas, California such as whole heads of romaine, hearts of romaine, and packages of precut lettuce and salad mixes which contain romaine, including baby romaine, spring mix, and Caesar salad.
If you have romaine lettuce at home:
Look for a label showing where the romaine lettuce was grown. It may be printed on the package or on a sticker.
If the label says “Salinas” (whether alone or with the name of another location), don’t eat it, and throw it away.
If it isn’t labeled with a growing region, don’t eat it, and throw it away.
If you don’t know if the lettuce is romaine or whether a salad mix contains romaine, don’t eat it, and throw it away.
Wash and sanitize drawers or shelves in refrigerators where romaine lettuce was stored. Follow these five steps to clean your refrigerator.
If you are buying romaine lettuce at a store:
Look for a label showing where the romaine lettuce was grown. It may be printed on the package or on a sticker.
If the label says “Salinas” (whether alone or with the name of another location), don’t buy it.
If it isn’t labeled with a growing region, don’t buy it.

Get more information here about this Food Safety Alert from the CDC website.