Public schools require proof that a child has been immunized against several diseases before enrolling. Why?
A)People don't realize that becoming vaccinated entails no risk.
B)It is a costly to fake signal that a child is healthy.
C)It is an efficient way to publicize the need for immunizations.
D)People do not adequately account for the external cost of not vaccinating their children.

Question

Quizplus · Accepted Answer

Public schools require proof of immunization as a way to promote herd immunity, which protects vulnerable populations that cannot be vaccinated and reduces the spread of disease. Failure to vaccinate can have external costs, such as increased healthcare costs and loss of productivity due to illness, which the wider community can bear. Requiring proof of immunization aims to encourage parents to account for these external costs and get their children vaccinated.

Public Schools Require Proof That a Child Has Been Immunized