Immunity acquired by encountering a pathogen either by vaccination or having the disease. The body produces specific antibodies against a pathogen. 

Agents that help to boost the immune response. Although they do not have protective effects themselves alone, they help to improve vaccine efficacy to provide higher protection.

A known vaccine side effect or any other undesirable side effect occurring after vaccination that is considered to be caused by the vaccine. Pain and/or redness at the injection site is an example of a side effect after vaccination.
Although most side effects that occur after vaccination may be related to the vaccine, some of these conditions are completely coincidental, ie. conditions that occur during or after vaccination but are not caused by the vaccine or related to it.

Exaggerated response of one’s body to substances, which are usually harmless, entering or coming into contact with the body.

Exaggerated response of one’s body to substances, which are usually harmless, entering or coming into contact with the body.

Life-threatening, severe systemic allergic reaction of rapid onset.

The proteins produced by the immune system specifically in response to an antigen entering the body. Also referred to as immunoglobulin.

A molecule that can be found on a virus or bacterium that triggers an immune response and allows the body to recognize and protect against future infection.

Blood serum containing antibodies effective against infectious microorganisms or toxic substances.