TABLE CHARACTERISTIC FOR 12 GI TRACT PATHOGENS & COMMENSALS

Instructions: Produce a Dichotomus/Bacterial Key including the following characteristics for the 12 GI Tract Pathogens as listed below. Base the key upon Gram positive or negative, Morphology, culturing and biochemical tests (glucose fermentation, coagulase + or -, catalse + or -, etc...).Submit Key in power point,jpeg image, orPDF file. ORGANISMCHARACTERISTIC

Campylobaacter jejuni

Campylobacter jejuni is a slender, spirally curved, motile Gram-negative rod. s requirement for reduced levels of oxygenutilizes a relatively large supply of serine, proline, aspartate, and glutamate;

Salmonella typhimurinSalmonella typhimurium is a Gram-negative, rod-shaped bacteriumg lactose negative, citrate positive, lysine decarboxylase positive, gelatin hydrolysis negative, and the production of hydrogen sulfide

Escherichia coliGram-negative, rod-shaped bacterium that causes.motile facultative anaerobes (they can makes ATP energy by aerobic respiration if oxygen is present, but is also capable of switching to fermentation)

Clostridium perfringensClostridium perfringens is a Gram-positive, spore-forming, heat-resistant, rod-shaped anaerobic bacterium, widely distributed in soil, marine sediment, decaying vegetation, and the intestinal tract of insects, humans and other vertebrates. The toxin is a zinc metallophospholipase that requires zinc for activation.

C. dificileEndospore-Forming Gram positive rods and cocci

oxygen requirements, motility, morph, catalase

Alcaligenes faecalis. It was originally named for its first discovery in feces, but was later found to be much more common in other places as well. Optimum growth occurs at about 37C with no pigmentation. While opportunistic infections do occur, the bacterium is generally considered non-pathogenic. When an opportunistic infection does occur, it is usually observed in the form of a urinary tract infectionGram-negative, rod-shaped, motile, non-nitrate reducing, oxidase positive, catalase positive, alpha hemolytic, and citrate positive(variable) obligate aerobe that is commonly found in the environment

Enterobacter faecalisFacultatively Anaerobic Gram negative rodsgrowth factors, morph., gram rxn., oxidase rxn., read Genera descriptions

Shigella sonnei1). Shigella are closely related to Escherichia coli and Salmonella and share common antigens with one another and other enteric bacteria. There are four species of Shigella: S. boydii, S. dysenteriae, S. flexneri,and S. sonnei.Shigella is a genus of bacteria belonging to the family Enterobacteriaceae. Species of this genus are Gram-negative, rod-shaped, and non-lactose fermenting (with exception to S. sonnei). They are also non-motile due to the lack of flagella and makes ATP (an energy molecule) by aerobic respiration if oxygen is present, but is also capable of switching to fermentation - facultative anaerobe. Shigella species can ferment carbohydrates with the production of acid, and grow in translucent white colonies (Figure

Bacillus cereusSome strains are harmful to humans and cause foodborne illness, while other strains can be beneficial as probiotics for animals.[1] It is the cause of "Fried Rice Syndrome," as the bacteria is classically contracted from fried rice dishes that have been sitting at room temperature for hours (such as at a buffet).[2Bacillus cereus is an endemic, soil-dwelling, Gram-positive, rod-shaped, beta hemolytic bacterium.

Vibrio choleraeFacultatively Anaerobic Gram negative rodsgrowth factors, morph., gram rxn., oxidase rxn., read Genera descriptions

Helicobacter pylori(Figure 1). The species name stems from: Helico, meaning helical or spiral shape, bacter, meaning bacteria, and pylori, refering to pylorus region of the stomach. This pathogen possesses five to seven distinct flagella and grows best when cultured at 37C (Figure 2). Interestingly, in resting individuals, 37C is the stomach's temperature - the targeted organ; however, the bacteria is able to withstand temperatures as low as 25C.Helicobacter pylori is a Gram-negative, curved S-shaped bacterium, which also has a non-cultural coccoid form with rounded ends

Listeria monocytogenes

Regular, Nonsporlating Gram positive rodsmorph., oxygen require, catalase

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