How is the smallpox vaccine administered?

How is the smallpox vaccine administered?

• A. Place the needle on the skin and jab directly into the muscle using a syringe.
• B. Insert the tip into the vial, see a small drop between the prongs, deposit the drop onto the skin, rapidly jab the droplet to puncture the skin within a 5 mm diameter, the jabs should be hard enough so that a drop of blood appears at the site, blot excess and cover the site.
• C. Apply the vaccine by rubbing it into the skin for several minutes.
• D. Spray the vaccine onto the skin with a jet device.

Answer: (B)

The method being tested is delivering the vaccine into the skin by creating a small, shallow wound rather than injecting into muscle or applying the vaccine in other ways. Smallpox vaccination historically used a percutaneous scarification technique with a special instrument, aimed at introducing the vaccine into the epidermal/dermal layers to provoke a strong immune response. Depositing a small amount of vaccine on a tiny skin area and then rapidly puncturing that area to create multiple superficial incisions within about a 5 mm circle aligns with this approach. The goal is to produce a localized reaction—the “take”—which indicates the vaccine has been delivered properly and the body is mounting immunity. A small amount of bleeding from the punctures can occur and is not the primary goal, but it can be a sign that the skin has been punctured enough to deliver the vaccine. The other options describe methods not used for smallpox vaccination: injecting into muscle, rubbing the vaccine into the skin, or spraying it with a jet device. These do not reliably deliver the vaccine to the skin layers in the manner that produces an adequate immune response for smallpox.

The method being tested is delivering the vaccine into the skin by creating a small, shallow wound rather than injecting into muscle or applying the vaccine in other ways. Smallpox vaccination historically used a percutaneous scarification technique with a special instrument, aimed at introducing the vaccine into the epidermal/dermal layers to provoke a strong immune response.

Depositing a small amount of vaccine on a tiny skin area and then rapidly puncturing that area to create multiple superficial incisions within about a 5 mm circle aligns with this approach. The goal is to produce a localized reaction—the “take”—which indicates the vaccine has been delivered properly and the body is mounting immunity. A small amount of bleeding from the punctures can occur and is not the primary goal, but it can be a sign that the skin has been punctured enough to deliver the vaccine.

The other options describe methods not used for smallpox vaccination: injecting into muscle, rubbing the vaccine into the skin, or spraying it with a jet device. These do not reliably deliver the vaccine to the skin layers in the manner that produces an adequate immune response for smallpox.