Question

use your understanding of prevention and treatment of viruses to answer the questions below.
a □ is a substance containing incomplete portions of a virus that produce an immune response when injected into the body.

Explanation:

This describes a subunit (subunit recombinant) vaccine, more specifically a viral vector or subunit vaccine that uses incomplete, non-infectious viral fragments to safely trigger the body's adaptive immune system to recognize and fight the actual virus without causing full infection. The most fitting single term is subunit vaccine, as it uses incomplete viral portions to elicit an immune response when injected.

Answer:

Subunit vaccine