How is the vaccine given, then?
A. A bifurcated needle (one with two prongs, like a tiny shrimp fork) is dipped into the smallpox vaccine solution. The needle retains a droplet of the vaccine and then is administered by 15 quick pricks to an area on the upper arm. Successful vaccination produces a sore that recipients must cover with a gauze bandage and tape for 2 to 3 weeks.