Romaine lettuce has begun returning to grocery retail and other channels.

Lettuce growers in California and southern Arizona have begun shipping romaine with labels indicating where it was harvested and indicating that it’s safe for consumption, according to a story in USA Today.

On Nov. 26, the United States Food and Drug Administration traced an outbreak of E. coli to farms on California’s central coast and said lettuce from other regions was uncontaminated.

Three E. coli outbreaks linked to romaine have occurred in 2018, according to the story.