This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Electron Microscope Uknown slide types Causative agent: Listeria monocytogenes Category: classical intracellular parasite Kingdom: Bacteria Division: Firmicutes Class: Bacilli Order: Bacillales Family: Listeriaceae Genus: Listeria Species: monocytogenes Disease: Meningitis, neonatal infections leading to abortions and still births, may be confused with diptheroids and erroneously disregarded as a contaminant. Major source of infection is contaminated food. Those ar highest risk include pregnant women, their fetuses and newborns. Contaminate food include; cabbage, raw fruit, pasteurized and unpasteurized dairy products. Uncommonly diagnosed infection; typically sporadic; few recent outbreaks associated with food; nosocomial acquisition; 40% of clinical cases occur in infants; in adults infection occurs mainly after age 40; European studies have disclosed large numbers of human carriers; case fatality rate in newborns is 50% Gram stain 1000X magnification oil immersion Morphology & Gram RX: Will grow at 4 degrees celsius, but is most motile at room temperature (tumbling motility), highly pleomorphic, occurring generally as small rods with rounded ends, 0.5 - 2.0 microns long and 0.4 - 0.5 microns wide, singly and in V-shaped pleomorphic, occurring generally as small rods with rounded ends, 0....
View Full Document