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,
April 16, 2022
Water: An Overlooked Essential Nutrient
April 16, 2022



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 typhimurin
Salmonella 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 coli
Gram-negative, rod-shaped bacterium that causes.motilefacultative anaerobes (they can makes ATP energy by aerobic respiration if oxygen is present, but is also capable of switching to fermentation)

Clostridium perfringens
Clostridium 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. dificile
Endospore-Forming Gram positive rods and cocci oxygen requirements, motility, morph, catalase

Alcaligenes faecalis. It was originally named for its first discovery infeces, but was later found to be much more common in other places as well. Optimum growth occurs at about 37°C with nopigmentation. Whileopportunistic infections do occur, thebacterium is generally considered non-pathogenic. When an opportunistic infection does occur, it is usually observed in the form of a urinary tract infection
Gram-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 faecalis
Facultatively Anaerobic Gram negative rodsgrowth factors, morph., gram rxn., oxidase rxn., read Genera descriptions

Shigella sonnei1).Shigella are closely related toEscherichia coli andSalmonella and share common antigens with one another and other enteric bacteria. There are four species ofShigella: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 toS. 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 causefoodborne illness, while other strains can be beneficial asprobiotics 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 abuffet).[2
Bacillus cereus is anendemic, soil-dwelling, Gram-positive, rod-shaped, beta hemolyticbacterium.

Vibrio cholerae
Facultatively 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, andpylori, refering to pylorus region of the stomach. This pathogen possesses five to seven distinct flagella and grows best when cultured at 37°C (Figure 2). Interestingly, in resting individuals, 37°C is the stomach’s temperature – the targeted organ; however, the bacteria is able to withstand temperatures as low as 25°C.
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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