Vaccinia Virus

Vaccinia virus is a type of virus used in the smallpox vaccine to help immune systems recognize and fight related viruses. It belongs to the poxvirus family and is similar to the smallpox virus but causes milder or no illness. Vaccinia is usually applied through a skin scratch or eye drop, prompting the body to develop immunity without causing serious disease. It played a key role in eradicating smallpox, a highly contagious and deadly disease. Today, its main use is in vaccines and some cancer treatments, although it is carefully handled due to its potential to cause infections in certain individuals.