[Last Modified: ]
[Brugia malayi] [Brugia timori] [Dirofilaria spp.] [Loa loa] [Mansonella ozzardi] [Mansonella perstans] [Mansonella streptocerca] [Onchocerca volvulus] [Wuchereria bancrofti]

Adult males of Onchocerca volvulus measure 15-45 mm in length; females are 30-50 cm.  Adults usually reside in nodules (onchocercomas) in subcutaneous tissue.

A	B

A, B: Adults of O. volvulus in a subcutaneous nodule, stained with hematoxylin and eosin (H&E).

C	D

C, D: Adults of O. volvulus in a subcutaneous nodule, stained with H&E.

E

E:  Cross-section of an adult female Onchocerca sp. from the biopsy of a scalp nodule from a patient from Liberia.  Note the presence of the intestine (blue arrow), uterine tubes (red arrows) and some cuticular nodules (green arrows).  Also notice the weak musculature under the thick cuticle.  Image courtesy of Drs. Philip LeBoit and Paul Borbeau.