Question at position 73 How do vaccines protect against disease?The use a weakened, killed, or subunit of a disease agent to prepare your immune system to respond to the diseaseThey use toxic chemicals to boost your immune systemThey don’t They give you the disease so you can become immuneClear my selection

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BlackTom AI · Accepted Answer

When considering how vaccines protect against disease, we must evaluate what each option implies about the biological mechanism at play.
Option 1: 'The use a weakened, killed, or subunit of a disease agent to prepare your immune system to respond to the disease' correctly describes the core idea of vaccination. Vaccines present a safe form of an antigen—whether weakened, inactivated, or a fragment/subunit—that trains the immune system to recognize and respond to the real pathogen, establishing immune memory so subsequent exposure can be fought off more efficiently. This reflects established immunology concepts like priming B and T cells to recognize specific pathogen components.
Option 2: 'They use toxic chemicals to boost your immune system' is misleading. Vaccines may include adjuvants to enhance the immune response, but these are not “toxic chemicals” deployed to boost immunity in a general sense. They are carefully chosen compounds that safely boost the body’s response to an antigen, and labeling them as toxic chemicals misrepresents their purpose and safety profile.
Option 3: 'They don’t' asserts that vaccines have no protective effect, which is factually incorrect. A vast body of evidence demonstrates that vaccines reduce the incidence of vaccine-preventable diseases and help establish herd immunity, thereby protecting individuals and communities.
Option 4: 'They give you the disease so you can become immune' describes a harmful misconception. Vaccines do not expose people to full-blown disease; they use safer forms or parts of the pathogen to elicit immunity without causing the illness itself, thereby avoiding the risks of natural infection.
Put together, the statements contrast a scientifically accurate mechanism with several misrepresentations. The accurate description centers on presenting a harmless form of the pathogen to train the immune system so it can respond quickly upon real exposure, which aligns with how vaccines function in practice.

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