Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content


This negative-stained transmission electron microscopic (TEM) image depicted the ultrastructural details of an Orf virus, a member of the genus Parapoxvirus. Note the spiral arrangement of the external tubular ridges, on the ovoid-shaped virus particle, or virion. The Orf virus is a pathogen common to sheep and goats, but can at times be transmitted to humans, in which case the virus is known as being zoonotic. When a human being becomes infected, the symptoms are mainly confined to the skin, and consist of weeping nodules, manifesting upon the dorsum, or back of the hands, and which heal in approximately thirty-five days, in a spontaneous fashion.
High Resolution: Click here for hi-resolution image (18.98 MB)
Content Providers(s):CDC/ Dr. A. Likos
Creation Date:
Photo Credit:Cynthia Goldsmith
CDC Organization
Skip Navigation Links.

Skip Navigation Links.
Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.