Annual reports on the MDP tests and results are available on the USDA’s AMS website.
The most recent report with full-year statistics is for 2009 when the program tested cantaloupe, cilantro, green onions, hot peppers, lettuce, spinach, sprouts and tomatoes for presence of salmonella and pathogenic E. coli. The AMS reports about 17,000 samples were collected from more than 600 food distribution sites in the continental U.S. in 2009. Samples included domestic, imported, conventional and organic produce.
The 2009 sampling took place in California, Colorado, Florida, Maryland, Michigan, Minnesota, New York, Ohio, Texas, Washington, and Wisconsin. The testing program confirmed a total of 32 positive salmonella isolates and 24 positive E. coli isolates for the entire year.
For 2012, the commodities on the MDP testing list were: alfalfa sprouts, cantaloupe, cilantro, hot peppers,
bagged lettuce, bagged spinach and tomatoes, including cherry, grape and roma/plum varities. According to the AMS website, the normal monthly sampling rate was 64 site samples per commodity. Three individual unit samples of each commodity tested were collected.