![bannermenu.jpg bannermenu](/dpdx/images/dpdx-2.jpg?_=00319)
Case #414 – February 2016
A 7-year-old boy was presented to his health care provider with symptoms of intermittent diarrhea, abdominal pain and loss of appetite. A stool specimen was collected in 10% formalin and zinc PVA (Zn-PVA) for routine ova-and-parasite (O&P) examination. Figures A–F show what was observed at 1000x magnification with oil on a trichrome-stained smear made from stool preserved in the Zn-PVA. The objects of interest measured 7-13 µm. Figures A and B show the same object at different focal planes. What is your diagnosis? Based on what criteria?
![Case414_A.jpg](/dpdx/images/casestudies/2016/Case414_A.jpg?_=97946)
Figure A
![Case414_B.jpg](/dpdx/images/casestudies/2016/Case414_B.jpg?_=97928)
Figure B
![Case414_C.jpg](/dpdx/images/casestudies/2016/Case414_C.jpg?_=97917)
Figure C
![Case414_D.jpg](/dpdx/images/casestudies/2016/Case414_D.jpg?_=97811)
Figure D
![Case414_E.jpg](/dpdx/images/casestudies/2016/Case414_E.jpg?_=97817)
Figure E
![Case414_F.jpg](/dpdx/images/casestudies/2016/Case414_F.jpg?_=97872)
Figure F
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/.