www.CHESTERCMS.org Listeriosis: a Growing, But Often Underrated Problem continued from page 17 Figure 1: Documented U.S. Listeriosis Outbreaks, 2011 - 2020 Year 2011-2012 Main Product involved Imported Ricotta Cheese Italy Florida 4 Illinois 2 Delaware 2 Quaeso Cheese Cheese products Soft Cheeses Commercially-prepared Ice cream products Raw milk Frozen vegetables 2017: Soft raw milk cheese 2018: Pork products TX, OK, AL Pennsylvania Ohio 13 + D.C. 10 12 4 2 9 Washington 4 New York 4 Texas Deli ham 2019-2020: 28 California Packaged salads 2019: California caramel apples 2016: Mung bean sprouts # states affected Colorado 2014: 2015: Origin Cantaloupes 2012: 4 No. Carolina 2 Hard-boiled eggs Georgia Deli-sliced meats and cheeses Unknown 9 Deli meats, individual cases Unknown 13 Enoki mushrooms Korea 17 Source: cdc.gov/listeria/outbreaks/index.html 18 CHESTER COUNT Y Medicine | WINTER 2021 5http://www.cdc.gov/listeria/outbreaks/index.html