A medical student is reviewing the routine childhood immunization schedule recommended by the Centers for Disease Control and Prevention (CDC). Arrange the following vaccines in chronological order based on the recommended age for the administration of the FIRST dose in a healthy, full-term infant.
- 1Hepatitis B vaccine
- 2Diphtheria, tetanus, and acellular pertussis (DTaP) vaccine
- 3Measles, mumps, and rubella (MMR) vaccine
- 4Human papillomavirus (HPV) vaccine
Answer
The correct chronological sequence for the first doses of these vaccines is: Hepatitis B (birth), DTaP (2 months), MMR (12 months), and HPV (11-12 years).
The standard CDC immunization schedule dictates that the first dose of the Hepatitis B vaccine is given at birth. The primary series for the DTaP vaccine begins at 2 months of age. The MMR vaccine is delayed until 12 months of age because it is a live-attenuated vaccine and requires the clearance of maternal antibodies for optimal efficacy. Finally, the HPV vaccine is administered starting at 11-12 years of age. This sequence correctly reflects the chronological administration of these vaccines in a healthy child.
Step-by-Step Solution
Key Concept
Routine Childhood Immunization Schedule Timing