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Jun 11, 2024 · Listeria is a short gram-positive rod that occurs singly or in short chains. However, the identification of Listeria on Gram stain may be challenging. Listeria may resemble pneumococci (diplococci) or diphtheroids (Corynebacteria) or be gram variable and confused with Haemophilus species .
Jul 4, 2023 · Listeria monocytogenes is a gram-positive, facultative intracellular rod bacteria that is catalase positive and beta-hemolytic when grown on blood agar. There have been several historical foodborne illness breakouts involving L. monocytogenes.
Mar 16, 2022 · A Gram stain helps diagnose harmful bacteria. Under a Gram stain, different kinds of bacteria change one of two sets of colors (pink to red or purple to blue) under a special series of stains and are categorized as “gram-negative” or “gram-positive,” accordingly.
Aug 23, 2023 · The Gram stain indicates a bacterial pathogen consistent with Listeria monocytogenes. L. monocytogenes is usually transmitted by ingestion of contaminated foods such as raw vegetables, dairy products and meat.
Patient Education. Food safety brochures. Information for pregnant women about soft cheeses. Community educator’s guide. More resources. Guidelines for Submitting a Listeria Specimen to CDC. CDC offers confirmatory identification and subtyping of Listeria species recovered from normally sterile sites. Learn who may submit a specimen.
Listeriosis is bacteremia, meningitis, cerebritis, dermatitis, an oculoglandular syndrome, intrauterine and neonatal infections, or rarely endocarditis caused by Listeria species. Symptoms vary with the organ system affected.
Nov 20, 2023 · On Gram stain, Listeria may resemble pneumococci (diplococci), enterococci, or diphtheroids (Corynebacteria) or be gram variable and be confused with Haemophilus species ( picture 2) [ 3-5 ].
