The correct answer is A, enzyme immunoassays (EIA) for specific antibodies.  If Trichinella spiralis larvae are identified in a stained section of a muscle biopsy then a definitive diagnosis can be made.  However, serologic assays are sensitive and collection of serum samples is less invasive than performing muscle biopsies.  Therefore, detection of T. spiralis specific antibodies is the most routine method for diagnosing trichinellosis.

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