ID#: 22241
This image depicted a close view of a pig’s outer ear. Intradermal injections, consisting of an antigenic mixture prepared from Trichinella spiralis larvae, were administered in this area, in order to test for the presence of a T. spiralis infection in this animal. It is important to note the raised wheal that developed at each injection site, each surrounded by a ring of erythema. These reactions were outlined in a pen line drawn upon the pig’s skin.
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Content Provider(s): CDC/ Dr. Irving G. Kagan
Creation Date: 1964
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.