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Case #502 – October, 2019

Iron-hematoxylin stained thick blood films from an 18-year-old male resident of Equatorial Guinea were examined as a part of a field study. Two objects were detected in one blood film. The object at the top of the field shown in Figure A (magnified in Figure B) measured approximately 246 µm; the bottom object in Figure A (magnified in Figure C) measured approximately 198 µm. What is your diagnosis? Based on what features?

Figure A

Figure A

Figure B

Figure B

Figure C

Figure C

Images presented in the dpdx case studies are from specimens submitted for diagnosis or archiving. On rare occasions, clinical histories given may be partly fictitious.

DPDx is an educational resource designed for health professionals and laboratory scientists. For an overview including prevention, control, and treatment visit www.cdc.gov/parasites/.