The FDA is telling consumers that romaine lettuce is safe to eat again.
Specially, they say they have received confirmation from the Arizona Leafy Greens Marketing Agreement administered by the Arizona Department of Agriculture that romaine lettuce is no longer being produced and distributed from the Yuma growing region and that the last date of harvest was April 16, 2018. 
So, it is unlikely that any romaine lettuce from the Yuma growing region is still available in stores or restaurants due to its 21-day shelf life.
The FDA is continuing to investigate illnesses related to romaine lettuce from the Yuma growing region. Over all  172 cases were reported in three states, including 75 hospitalizations and one one death.  
However, it’s complicated by the fact that the ongoing trace back investigation indicates that the illnesses associated with this outbreak cannot be explained by a single grower, harvester, processor, or distributor. 
“While traceback continues, FDA will focus on trying to identify factors that contributed to contamination of romaine across multiple supply chains,” the agency says. “The agency is examining all possibilities, including that contamination may have occurred at any point along the growing, harvesting, packaging, and distribution chain before reaching consumers.”