Here's some more information:
http://www.cdc.gov/mmwr/preview/mmwrhtml/rr5010a1.htm
VACCINIA VACCINE
Dryvax,® the vaccinia (smallpox) vaccine currently licensed in the United States, is a lyophilized, live-virus preparation of infectious vaccinia virus (Wyeth Laboratories, Inc., Marietta, Pennsylvania). Vaccinia vaccine does not contain smallpox (variola) virus. Previously, the vaccine had been prepared from calf lymph with a seed virus derived from the New York City Board of Health (NYCBOH) strain of vaccinia virus and has a minimum concentration of 108 pock-forming units (PFU)/ml. Vaccine was administered by using the multiple-puncture technique with a bifurcated needle. A reformulated vaccine, produced by using cell-culture techniques, is now being developed.
This page has pictures, information on the different recombinant vaccines, and descriptions of complications of vaccination, as well as an outline of the plan for handling an outbreak.
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