Characteristics Of Serratia Marcescens : History

1016 WordsNov 18, 20165 Pages
Characteristics of Serratia marcescens History • 1263 – First historical recall about S. marcescens. The organism was the reason of the medieval ‘miracle’ at celebration of a Mass at Bolsena, when bread and body turned into the Body and Blood of Christ, and Eucharist appeared to bleed (Bennett JW and Bentley R, 2000, p.47). • 1819 – The bacterium genus was discovered by the Italian pharmacist Bartolomeo Bizio. He identified that polenta, reddish discoloration of boiled cornmeal, was caused by S. marcescens (Hopkins, 2005). • He named the genus in honor of the Italian physicist and inventor of the steamboat Serrati. The species marcescens means ‘decaying’ or ‘fading’ in Latin, and was chosen because of the ability of the organism’s…show more content…
marcescens can grow under extreme conditions, including disinfectants, antiseptics and double-distilled water in order to utilize a wide range of nutrients. • Found in human clinical specimens, water, soil, plants, digestive tract of rodents, and insects (Bergey&Holt, 1994, p.187). When isolated from the blood bags, the highest growth was determined under anaerobic conditions. • The effect of oxygen is negative when organism is under low-nutrient conditions. • High risk of growth in red blood cells stored at 4°C, as well as in plates stored at 22°C (Hejazi&Falkiner, 1997, p.904). • Optimum growth was observed at the pH of 9, and inhibited at pH of < 4.5. • Most species of Serratia are of human (fecal) origin. Usually S. marcescens is found in as a nosocomial infection in the urinary and respiratory tract, in cystic fibrosis, and in burns (Deguzman, 2012). Characteristics • Gram(-)ve and oxidase(-)ve straight bacilli, 0.5-0.8 microns in diameter and 0.9-2.0 microns in length. Facutatively anaerobic, chemoorganotrophic organisms that have a respiratory and a fermentative types of metabolism. Catabolize D-glucose and other carbohydrates with production of gas and acid when grown at 30-37°C. Methyl Red (-)ve (Bergey&Holt, 1994, p.187). • Hanging drop preparation identifies motile organisms. • Appear as convex, raised, greyish colonies with narrow zones of
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