How many injections are given for a first-time smallpox vaccination?

How many injections are given for a first-time smallpox vaccination?

• A. 8
• B. 12
• C. 15
• D. 20

Answer: (C)

Delivering the smallpox vaccine relied on scarification: a bifurcated needle is dipped in vaccine and then used to make multiple superficial punctures in a small skin patch. The aim is to deposit enough vaccine into the epidermal and dermal layers to provoke a strong immune response. The number of punctures used for a first-time vaccination is about 15, providing a reliable dose to generate the characteristic take. Why this is the best choice: 15 punctures balance delivering sufficient vaccine with minimizing tissue trauma, maximizing contact with skin immune cells, and producing the vesicular take that indicates successful immunization. Other counts—fewer or more punctures—do not align with the standard practice that reliably yields a proper immune response.

Delivering the smallpox vaccine relied on scarification: a bifurcated needle is dipped in vaccine and then used to make multiple superficial punctures in a small skin patch. The aim is to deposit enough vaccine into the epidermal and dermal layers to provoke a strong immune response. The number of punctures used for a first-time vaccination is about 15, providing a reliable dose to generate the characteristic take.

Why this is the best choice: 15 punctures balance delivering sufficient vaccine with minimizing tissue trauma, maximizing contact with skin immune cells, and producing the vesicular take that indicates successful immunization. Other counts—fewer or more punctures—do not align with the standard practice that reliably yields a proper immune response.