date:May 31, 2021
subsamples, with each subsample consisting of one or more heads or hearts of romaine lettuce and weighing at least 300 grams.
This approach the collection and testing of samples composed of multiple subsamples increases the probability of detecting pathogens if present, given that microbial hazards may not be uniformly present. Agency field staff collected all samples in their natural form but for the outer leaves having been removed. No fresh-cut lettuce was collected.
Ensuring the microbio