A vaccine contains an antigen to which the immune system...

A vaccine contains an antigen to which the immune system responds. Which of the following is not a possible component of a vaccine?
(a) Dead pathogen
(b) Toxoids
(c) Live, weakened pathogen
(d) Parts of a pathogen
(e) $\mathrm{c}$ and $\mathrm{d}$

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Key Concepts

Vaccine

A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. It typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. Vaccines stimulate the body's immune system to recognize the agent as a threat, destroy it, and remember it for future protection.

Antigen

An antigen is any substance that causes the immune system to produce antibodies against it. In the context of vaccines, antigens are the components (or parts of components) of pathogens that are recognized by the immune system. The presence of antigens in a vaccine allows the body to develop immunity by eliciting an immune response without causing the full-blown disease.

Types of Vaccine Components

Vaccine components include a variety of substances that can act as antigens. These include whole inactivated (dead) pathogens, live attenuated (weakened) pathogens, toxoids (inactivated toxic compounds produced by certain bacteria), and specific subunits or parts of a pathogen. Each type is designed to safely expose the immune system to the relevant antigens, thereby training it to respond effectively if it encounters the actual pathogen in the future.

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