Cowpox, or the virus that causes it.
- Smallpox vaccine contains live vaccinia virus, a milder cousin of the variola virus.
- A live, replicating virus, vaccinia can cause side effects, which on rare occasions can be serious and potentially life-threatening.
- Jenner waited only four years before declaring that the vaccine that he named vaccinia provided immunity from smallpox for life.
Definition of vaccinia in:
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