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Section 18: Infectious Diseases

Choose the correct statement(s) regarding the white blood cell (WBC) count and differential.

A. WBC count is usually elevated in response to infection

B. The normal range of the WBC count is 12,500 to 20,000 cells/mm3 (12.5-20.0 x 109/L)

C. WBC count is nonspecific and can be elevated in response to a number of noninfectious conditions

D. Neutrophils are the most common type of WBC in the blood

E. A, C, and D are correct statements

The answer is E

The inflammatory process initiated by infection can set up a complex set of host responses which include:

A. Activation of the complement cascade

B. An increase in the erythrocyte sedimentation rate

C. Elevations of C-reactive protein

D. Increased production of interleukins and tumor necrosis factor

E. All of the above

The answer is E

Which of the following circumstances would be considered the most consistent with colonization by normal microbiota?

A. S. epidermidis found on the skin

B. S. aureus in the bloodstream

C. E. coli in the urine

D. Viridans streptococci found in the nasopharynx

E. Both A and D

The answer is E

Choose the correct statement(s) regarding the identification of potential pathogens

A. The Gram stain may provide a presumptive diagnosis and identify whether the pathogen is gram-positive or gram-negative and a bacillus or coccus

B. Cultures can provide definitive pathogen identification and differentiate organisms on the basis of biochemical characteristics more rapidly than molecular-based methods

C. MALDI-TOF MS can rapidly speciate most microbes on the basis of genetic markers

D. Even with automated systems, detection of bacteria or fungi within a few hours is not yet possible

E. All of the above

The answer is A

Although widely employed, the use of molecular methods is often limited by ...

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