Health workers think they know what caused the E. coli outbreak that sickened at least 33 in New Jersey and 71 nationwide. However, they say it wasn?t green onions.

The Centers for Disease Control (CDC) said Wednesday that Taco Bells across the country didn?t have to pull green onions from their menus after all. According to the CDC, it now believes shredded lettuce was most likely the source of the outbreak. Though the CDC believes lettuce may be the culprit, no tests have confirmed the information.

Taco Bell officials made sure that restaurants across the country sanitized their facilities. They also switched to a different food distributor to make sure the outbreak doesn?t occur again. The CDC will now try to find out the source of the lettuce, since it is sure the vegetable was contaminated before it reached restaurants.

Related Information:NJ Taco Bells beckon customers to border after E. coli scare Rutgers scientist tackles questions about E. coli in light of outbreak E. coli outbreak shuts down fast food restaurants in central New Jersey