Immunizations Back-Up Technician Practice Test

What route is used to administer smallpox vaccine?

Percutaneous Route Intramuscular Subcutaneous Oral

Correct Answer:

Percutaneous Route

Explanation:

The smallpox vaccine is given via a percutaneous route, meaning it is delivered through the skin rather than into muscle or fat. The traditional method uses superficial skin punctures or scarification (often with a special needle) to introduce the vaccine into the epidermis and upper dermis. This approach places the vaccinia virus where skin immune cells, like Langerhans cells, can efficiently present the antigen and elicit a strong immune response, often visible as a local reaction or “take.” Injecting into muscle or subcutaneous tissue would alter the way the immune system sees the vaccine, and oral administration isn’t effective for this vaccine. So, percutaneous administration is the route that optimally activates the immune system for the smallpox vaccine.

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