Case #168 - November, 2005
This was a case of Bancroft’s filariasis caused by Wuchereria bancrofti. Diagnostic features included:
- the presence of a sheath. Usually the sheath does not stain well with Giemsa, however it is partially visible in Figures A, D, and E.
- the nuclei in the tail evenly dispersed and terminating before the end of the tail (Figures C and E). This morphologic feature distinguishes W. bancrofti from Loa loa as the nuclei in the tail extend all the way to the tip of the tail in L. loa microfilariae.
- a size within range for W. bancrofti (240 to 300 μm) in stained blood films.
More on: Lymphatic Filiariasis
This case was kindly contributed by the Oregon State Public Health Laboratory.
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/.