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This photograph reveals the evolution of smallpox virus pocks, on the chorioallantoic membrane (CAM) of a developing embryonic chick. Poxviruses are very easy to isolate, and will grow in a variety of cell cultures, producing characteristic hemorrhagic pocks on the chick CAM, enabling controlled analysis in a laboratory setting.
High Resolution: Click here for hi-resolution image (18.88 MB)
Content Providers(s):CDC/ Dr. David Kirsh
Creation Date:1967
Photo Credit:
CDC Organization
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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.