How often does the CDC release Recommended Childhood and Adolescent Immunization Schedules for children in the United States?

A) every month
B) every year
C) every 3 years
D) only when circumstances require an update

CDC

An abbreviation for Centers for Disease Control and Prevention, a national public health institute in the United States.

Immunization Schedules

A chart or plan that outlines the timings and doses of vaccines recommended for people at different ages and health conditions.