Vaccinia

Vaccinia is a virus related to smallpox that was used in the smallpox vaccine to protect people from the disease. It is part of the poxvirus family and triggers the immune system to recognize and fight similar viruses. When vaccinated with vaccinia, the body learns to defend itself against smallpox, leading to immunity. The vaccine typically causes a mild skin reaction at the injection site. Vaccinia is also studied for its potential in cancer treatment and other medical uses. Overall, it played a key role in eradicating smallpox and remains a valuable tool in immunology research.