A 21-year-old man has had increasing malaise over the past three weeks. On physical examination his vital signs show T 39.2 C, P 105/minute, R 29/minute, and BP 80/40 mm Hg. The physician auscultates a loud systolic cardiac murmur. His lungs on auscultation have bibasilar crackles. Needle tracks are seen in his left antecubital fossa. He has splinter hemorrhages noted on fingernails, as well as painful erythematous nodules on palmar surfaces. A tender spleen tip is palpable. A chest radiograph shows pronounced pulmonary edema. Which of the following laboratory test findings is most likely to be present in this patient's peripheral blood?

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