title: Listeria methods development research at the Eastern Regional Research Center, U.S. Department of Agriculture.
abstract: Listeria methods research at the U.S. Department of Agriculture, Eastern Regional Research Center, has concentrated on 2 areas during the past year. The first was development of techniques for assessing isolation methods for their ability to detect sublethally stressed cells. It appears that a number of widely used media do not accurately detect Listeria that have been injured by thermal processing or acidification. The second was development of improved plating media. One, modified Vogel-Johnson agar, shows promise; it is highly selective and quantitative, and eliminates the need to select colonies on the basis of a blue color when illuminated with reflected light.
mesh_terms: D000818:Animals; D002417:Cattle; D005516:Food Microbiology; D008087:Listeria / Q000032:analysis*; D008089:Listeria monocytogenes / Q000032:analysis; D008460:Meat; D008892:Milk / Q000382:microbiology; D014481:United States; D014675:Vegetables