11. Cidofovir is toxic and untested against vaccinia in humans. 12. A : The vaccine is made from a related virus, called Vaccinia . 13. Vaccinia can also infect those who touch someone else's vaccination site.14. Thus, the vaccinia virus avoids the immune system. 15. Structurally BPXV looks like other OPVs and especially Vaccinia Virus ( VACV ). 16. Dryvax is a live-virus preparation of vaccinia prepared from calf lymph. 17. Vaccines containing vaccinia viruses were used effectively in the campaign to eradicate smallpox. 18. It is based on vaccinia , a close but harmless relative of smallpox virus. 19. Vaccinia -based vaccines played a major role in eliminating smallpox throughout the world.20. The method involves infecting calves with vaccinia , a virus related to small pox.
