Fig. 1.
Cowpox illustrations. a Lesion with necrotic ulcer on the outside of right arm with regional solid axillary lymphadenopathy. b Negative-staining electron microscopy of virus particle. C = Core; L = lateral bodies.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.