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Case #253 - June, 2009

A 30-month-old child born in China was recently adopted by a family in the Netherlands. Three consecutive stool specimens were obtained for ova and parasite (O&P) testing, as part of the standard procedure during child adoption. There were no complaints. A formalin-ethyl acetate concentration and a water sedimentation method were performed. The following figures show what was observed on a wet mount prepared from the concentrate. Figure AC were taken at 400x magnification; Figure D at 630x magnification. The objects were seen in moderate numbers in each concentrate and in all three stool specimens. The objects in Figure A measured approximately 24 to 37 micrometers. The objects in Figures BD measured 73 to 85 micrometers in length by 44 micrometers in width. What is your diagnosis? Based on what criteria?

Figure A

Figure A

Figure B

Figure B

Figure C

Figure C

Figure D

Figure D

This case and images were kindly provided by The Leiden University Medical Center, The Netherlands.

Images presented in the monthly 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/.

Page last reviewed: August 24, 2016