Swabs, Listeria Testing Kit (50)Hygiena InSite Listeria is an easy to use, self contained, environmental Listeria species test. Each device contains a chromogenic liquid media formulated with antibiotics, growth enhancers, and color changing compounds specific to Listeria species. Simply swab the test area and wait. A change in color after 24 48 hours of incubation is considered presumptive positive. No expensive lab equipment is required and no additional sample handling of the