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Inactivated vaccine

An inactivated vaccine (or killed vaccine) is a vaccine consisting of virus particles, bacteria, or other pathogens that have been grown in culture and then killed to destroy disease-producing capacity. In contrast, live vaccines use pathogens that are still alive (but are almost always attenuated, that is, weakened).

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Adaptive immune system

The adaptive immune system is one of the two main branches of the immune system, alongside the innate immune system.

Antigen

An antigen is a substance that triggers an immune response in the body.

Antigen-presenting cell

An antigen-presenting cell (APC) or accessory cell is a cell that displays an antigen bound by major histocompatibility complex (MHC) proteins on its surface; this process is known as antigen presentation.

Attenuated vaccine

An attenuated vaccine (or a live attenuated vaccine, LAV) is a vaccine created by reducing the virulence of a pathogen, but still keeping it viable (or "live").

Bacteria

Bacteria are single-celled microorganisms that have a wide range of shapes and sizes.

Cell-mediated immunity

Cellular immunity, also known as cell-mediated immunity, is an immune response that does not rely on the production of antibodies.

Cholera vaccine

A cholera vaccine is a vaccine that is effective at preventing cholera.

COVID-19 vaccine

The Wikipedia page on COVID-19 vaccine provides an overview of the various vaccines developed to combat the COVID-19 pandemic.