n. Serratia named after Serafino Serrati, an Italian physicist. Serratia marcescens was named by a pharmacist. The most common and pathogenic of the species in the genus, S. marcescens, is normally the only pathogen and usually causes nosocomial infections.In the hospital, Serratia species tend to colonize the respiratory and urinary tracts. Serratia marcescens can cause meningitis and other serious conditions. Susceptibility testing is also done. INTRODUCTION. The Biochemical identification of Serratia marcescens showed that bacteria were Gram –ve, Rod, Catalase positive, oxidase negative, lactose non- fermenter, motile, Indole negative, citrate utilization positive, TSI y/y, DNase positive and Urease negative as shown in table (1) as [27]. Serratia marcescens and Serratia liquefaciens are mainly cause of hospital-acquired infections. This enzyme has been the focus of studies on gene regulation, protein secretion, endonuclease action, and protein structure; it has … The strains were Gram-negative, catalase-positive and oxidase-negative rods, which is typical for enterobacterial group strains. To confirm Serratia marcescens produces an endonuclease with extraordinarily high specific activity that is released into the surrounding medium. Enterobacter most often cause nosocomial infections but can cause otitis media, cellulitis, and neonatal sepsis. Growth On DTC agar. 7 :69-74 (2) Bergey's Manual of Determinative Bacteriology (9th Edition,p.217,Table 5.2).Edited by John G. Holt,The Williams & Wilkins Co.. Proteobacteria / Gammaproteobacteria / Enterobacteriales / Enterobacteriaceae / Serratia. serratia marcescens. Serratia marcescens produces an endonuclease with extraordinarily high specific activity that is released into the surrounding medium.

As with many other . INTRODUCTION.

The colonies were pigmented only at room temperature or about 25 … The most common and pathogenic of the species in the genus, S. marcescens, is normally the only pathogen and usually causes nosocomial infections.In the hospital, Serratia species tend to colonize the respiratory and urinary tracts. Other Serratia species are much less common.

Strains S2, S9, S10 and S15T were urease-positive, while strains S3T and S13 were urease-negative. Biochemical Test and Identification of Serratia marcescens. Serratia species are gram-negative bacilli of the Enterobacteriaceae group of bacteria, although they are not a common component of healthy human fecal flora. fem. In immunocompromised patients, they can cause wound infections, infections of the kidney and urinary tract, respiratory tract infections and sepsis, endocarditis, meningitis, and prosthetic infections. The first description of S. marcescens is from a man named Bartolomeo Bizio who was a pharmacist that resided in the Padua Province of Italy in the early 1800s.At that time polenta was an important food of the people, but the cornmeal dish was found to be discolored red during a particularly warm and humid summer.


In addition, unknown showed complete resistance to the antibiotics penicillin and bacitracin. About Organism: Show All Tests : Show Unique Test Hierarchy: Description of values of test status. Serratia marcescens. Serratia species are gram-negative bacilli of the Enterobacteriaceae group of bacteria, although they are not a common component of healthy human fecal flora. DTC agar was the enrichment media we chose to grow Serratia marcescens. Ser.ra' ti.a .M.L. nov. Curr.Microbiol.

Diagnosis is by culture of blood and/or other infected tissue. The genome assembly of strain SM03 comprises a size comparable to that of other published genomes of S. marcescens strains. They are gram -ve, catalase positive, oxidase negative, MR negative and VP positive bacteria. Serratia is a genus of gram-negative, facultatively anaerobic, endospore forming, rod-shaped bacteria of the Enterobacteriaceae family. The usually red colonies had a bluish tinge when seen against the background of the blue DTC agar. Biochemical characterization of Serratia liquefaciens sensu stricto, Serratia proteamaculans and Serratia grimesii sp. 1. serratia marcescens, As is more common specifically to . Straight rods , 0.5–0.8 × 0.9–2.0 µm in length, with rounded ends.Conform to the general definition of the family Enterobacteriaceae .Gram negative, generally motile , by means of peritrichous flagella. Serratia, particularly S. marcescens, has greater affinity for the urinary tract. Serratia is a genus of gram-negative, facultatively anaerobic, endospore forming, rod-shaped bacteria of the Enterobacteriaceae family. Unlike the closely-related S. marcescens and S. nematodipila (see below) strains, four of the 15 strains (S2, S9, S10 and S15) were urease-positive. The genomic size of sequenced Serratia strains ranges from 4.85 Mbp to 6.3 Mbp. RESULTS. enterobacteriaceae, unknown tested positive for the presence of catalase but negative for the presence of oxidase and starch hydrolysis.


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