Answer to Question #90062 in Microbiology for kim
Listeria are facultative anaerobes. As a result, in some cases, they can use oxygen to produce ATP. However, in anaerobic conditions, they use fermentation pathways. In the human body, listeria are intracellular pathogens that penetrate macrophages or epithelial cells causing their destruction. In the host cell, listeria use actin filament machinery to move inside the cell.