A case of Listeria meningitis associated with increased adenosine deaminase in cerebrospinal fluid.

We present, to the best of our knowledge, the first case of listeria meningitis with increased adenosine deaminase (ADA) in cerebrospinal fluid. Although some cases of other etiologies were also reported, this report informs those who manage patients with meningitis that not only Mycobacterium and Brucella spp. but also other facultative agents can increase ADA levels in cerebrospinal fluid, possibly through monocyte-macrophage activation.