Vaccinia (smallpox) vaccine. Recommendations of the Immunization Practices Advisory Committee (ACIP).

These revised recommendations on vaccinia (smallpox) vaccine update the previous recommendations (MMWR 1985; 34:341-2) and include current information on its use among laboratory and health-care workers occupationally exposed to vaccinia, recombinant vaccinia viruses, and other orthopoxviruses that can infect humans. This report also contains revised recommendations on revaccination of high-risk workers and information on contraindications to vaccination.