Table 2.

Codebook.

Structural code	Description
Disease prevention	Statements regarding the ability of vaccines to prevent disease(s). Also includes statements regarding the ability of a vaccine to affect (a) an individual’s risk of getting disease(s) and (b) transmission of disease(s) from one person to another.
Immunology beliefs	Statements that describe (a) how the human body and its systems and organs prevent or overcome infection or disease and (b) how vaccines help or harm the immune system.
Herd immunity	Statements regarding (a) prevention of suffering in individuals or groups, (b) prevention of disease spread at the population level, (c) role of vaccines in population protection, and (d) role of herd immunity in individual protection against VPD(s).

VPD: vaccine-preventable disease.