Inflammatory cells have difficulty limiting the colonization of microorganisms in infective endo-carditis because the:
a. microorganisms are resistant.
b. valves are avascular.
c. microorganisms are sequestered in a fibrin clot.
d. colonies overwhelm the phagocytes.
ANS: C
In endocarditis, bacterial colonies are inaccessible to host defenses because they are embedded in the protective fibrin clots; it is not because the microorganisms are resistant, that the valves are avascular, or that the colonies overwhelm the phagocytes.
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