Infectious Diseases: Clinical Correlations

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Chapter 30

Infectious Diseases

Clinical Correlations

Sexually Transmitted Diseases (STDs)

II Urinary Tract Infections (UTIs) (Table 30-2)

TABLE 30-2

Bacteria Causing Urinary Tract Infections

Organism Distinguishing Features Notes
Escherichia coli Gram negative, no capsule, red-black colonies on EMB agar Most common cause of UTIs (50% to 80%)
Staphylococcus saprophyticus Gram positive, coagulase negative, resistant to novobiocin Second most common cause of UTIs in young women (10% to 30%)
Proteus mirabilis Gram negative, urease positive, swarming growth on agar Associated with struvite urinary stones
Klebsiella pneumoniae Gram negative, nonmotile, prominent capsule, large mucoid colonies Usually in catheterized patients
Enterobacter species Gram negative, motile, capsule, moist colonies, often drug resistant Usually in immunocompromised patients
Pseudomonas aeruginosa Gram negative, oxidase positive, fruity odor, blue-green pigment Usually in patients with kidney stones, chronic prostatitis, or a catheter
Enterococcus faecalis Gram positive, variable hemolysis, salt tolerant (6.5% NaCl) Usually in immunocompromised or catheterized patients

UTI, urinary tract infection.

III Infectious Diarrheas (Tables 30-3 and 30-4)

TABLE 30-4

Food Sources of Bacterial Infections

Food Bacteria
Poultry Salmonella enteritidis, Campylobacter species
Raw eggs Salmonella enteritidis
Dairy products Listeria monocytogenes, Brucella species, Mycobacterium bovis
Shellfish Vibrio species
Reheated rice Bacillus cereus
Undercooked beef Escherichia coli O157:H7, B. cereus, Brucella species, C. perfringens
Picnic foods (mayonnaise, custard, salted meats) S. aureus toxin mediated

Distinguishing features of three types

1. Noninflammatory diarrhea is watery

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