According to Food Safety Magazine, since 2014, the U.S. Food and Drug Administration (FDA) has been trying a new approach to produce sampling to assess microbial contamination in food commodities. The approach involves collecting a statistically-valid number of samples of targeted foods over a 12-18 month period, then identifying common microbial factors among them.
For fiscal year 2018, FDA had already been sampling fresh herbs, specifically basil, parsley, and cilantro, along with processed avocado and guacamole–all from both domestic and imported sources. The fresh herbs were chosen for sampling because they are eaten without having gone through any type of kill step (ie. cooking) to reduce or eliminate pathogens. Also, these items are grown low to the ground, which makes them susceptible to contamination. Initially, the sampling was to measure the prevalence of Salmonella and Shiga toxin-producing E. coli (STEC) in these herbs.
Recently, FDA added a new test to this sampling group: Cyclospora cayetanensis. The agency has a new analytical testing method for this parasite.
And my kid is really into this song; also no explanation.