The patented Actero™ Listeria Enrichment Media is a selective medium specifically optimized for single-step recovery and enrichment of Listeria spp. from food and environmental samples. With the EZ-Media Dry Bag format, the entire medium preparation method takes less than 30 minutes. Just add deionized water through the “in” port and gently massage the bag to mix. For the 5L bags, there are 15 dry media bags per case. For the 20L bags, there are 12 dry media bags. This formulation is the patented “Elite” line of Actero™ enrichment media products.