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Case #408 - November 2015

A 65-year-old man from rural Canada presented with pruritus on his chest; he mentioned that even with frequent bathing the symptoms persisted. Possible arthropod ectoparasites were observed on his chest hair (Figure A) and a specimen was collected and sent to the Microbiology lab for examination. Figure B shows a close-up of one of the organisms observed by the attending microbiologist. The object measured 1.5 mm in length. What is your diagnosis? Based on what criteria?

Figure A

Figure A

Figure B

Figure B

This case and images were kindly provided by the Cadham Provincial Public Health Laboratory, Winnipeg, Manitoba, Canada.

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/.

Page last reviewed: November 2, 2020