Table 2.

Glossary of terms

Term	Definition
Adjuvant	An ingredient used in some vaccines that helps create a stronger immune response in patients receiving the vaccine
Immunogenicity	The ability of a vaccine to elicit an immune response
Reactogenicity	Typical symptoms (e.g., fever, sore arm, muscle aches) that occur shortly (days) after vaccine administration either at the site of vaccination or systemically
Seroconversion	Development of antibodies to a pathogen, elicited by a vaccine (or infection), in the blood of an individual who previously did not have detectable antibodies
Seroprotection	An antibody level capable of protecting against infection or disease
Titer	Numerical value indicating the level of antibody against a particular pathogen