Discussion
Which of the following is not true of Actinomycosis:
Answer: C
Correct answer: Organism cannot be cultured
Actinomyces israelii can certainly be cultured, though it demands anaerobic or microaerophilic conditions and patience - the molar tooth colonies may take a week or more to appear on brain heart infusion or thioglycollate medium. The other three statements are all true of actinomycosis: sulphur granules are found in the pus, crushing them shows branching filaments, and A. israelii is the usual agent. Failure to grow the organism usually reflects prior antibiotics or inadequate anaerobiosis, not any inherent unculturability.
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