Listeria meningitis

Listeria meningitis is a meningitis caused by Listeria monocytogenes (Listeria monocytogenes). It is more common in infants and young children, the elderly, and adult patients with immunodeficiency. In addition to causing meningitis, this bacterium can also cause pregnancy infections, neonatal septic granuloma, sepsis, and focal infections. Such as skin abscess, purulent conjunctivitis, lymphadenitis, and endocarditis (more damage to the left heart) ), Osteomyelitis, etc. Listeria is a Gram-positive short bacillus with a size of (1 ~ 2) μm * 0.5 μm, usually in a double arrangement, does not produce spores, does not generally form a capsule, and can form mucopolysaccharide pods in serum-containing glucopeptone water membrane. Flagella can be seen with flagella staining. This bacterium is aerobic or facultative anaerobic, and does not require high nutrition. It can grow on ordinary medium and can grow at 3 ~ 45 ℃, but the optimal temperature is 30 ~ 37%. On blood agar plates for 18 to 24 hours at 35 ° C, the colonies were off-white and had a diameter of 1 to 2 mm. Can produce a narrow hemolytic ring. Cultured on a nutrient agar plate at 35 ° C. for 18 to 24 hours, can form round, smooth, transparent colonies with a size of 1 to 2 mm and a hemolytic ring.