Listeriosis laboratory tests
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: João André Alves Silva, M.D. [2]
Overview
The are no laboratory findings characteristic of listeriosis.
Laboratory Findings
Diagnosis is confirmed only after isolation of Listeria monocytogenes from a normally sterile site, such as blood, or from amniotic fluid or the placenta in the setting of pregnancy.
Listeria monocytogenes can be readily isolated on routine media, but care must be taken to distinguish this organism from other Gram-positive rods, particularly diphtheroids. Selective enrichment media improve rates of isolation from contaminated specimens.