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The ability of the divalent cations magnesium, iron, calcium and manganese; yeast extract; pyruvate; catalase; and the carbohydrates glucose, lactose, sucrose, esculin, fructose, galactose, maltose, and mannose to facilitate repair of heat-injured Listeria monocytogenes and Listeria innocua was evaluated. Listeria populations were injured by heating at 56 degrees C for 50 min. To determine the effects on repair, Trypticase soy broth (TSB) was supplemented with each medium component to be evaluated. Repair occurred to various degrees within 5 h in TSB supplemented with glucose, lactose, sucrose, yeast extract, pyruvate, or catalase. Chelex-exchanged TSB was supplemented with divalent cations; magnesium and iron cations were found to have a role in repair. Listeria repair broth (LRB) was formulated by utilizing the components that had the greatest impact upon repair. When incubated in LRB, heat-injured Listeria cells completed repair in 5 h. After the repair, acriflavin, nalidixic acid, and cycloheximide were added to LRB to yield final concentrations identical to those of the selective enrichment broths used in the procedures of the Food and Drug Administration and the U.S. Department of Agriculture. The efficacy of LRB in promoting repair and enrichment of heat-injured Listeria cells was compared with that of existing selective enrichment broths. Repair was not observed in the Food and Drug Administration enrichment broth, Listeria enrichment broth, or University of Vermont enrichment broth. The final Listeria populations after 24 h of incubation in selective enrichment media were 1.7 x 10(8) to 9.1 x 10(8) CFU/ml; populations in LRB consistently averaged 2.5 x 10(11) to 8.2 x 10(11) CFU/ml.

Development of a repair-enrichment broth for resuscitation of heat-injured Listeria monocytogenes and Listeria innocua