Vaccination Schedule for 9-Month-Old Children
At 9 months of age, the only routinely recommended vaccination is measles vaccine (or MMR where available), making none of the provided options fully correct for standard U.S. immunization schedules.
Standard Vaccines Due at 9 Months
Measles vaccination is the primary vaccine recommended at 9 months of age according to the WHO schedule, though in the United States, MMR is typically delayed until 12 months 1.
The 9-month visit traditionally includes measles vaccine in many international schedules, particularly in endemic areas 1.
Why the Listed Options Are Incorrect
DTaP Timing Issues
DTaP is NOT due at 9 months - the standard DTaP schedule includes doses at 2,4,6, and 15-18 months, with the final dose at 4-6 years 1.
The third dose of DTaP should be completed by 6 months of age, and the fourth dose is not given until 12 months at the earliest (preferably 15-18 months) 1, 2.
BCG Considerations
BCG is given at birth, not at 9 months in countries where it is part of the routine schedule 1.
BCG is not part of the routine U.S. immunization schedule 1.
Polio Vaccine Timing
OPV/IPV doses are completed by 6 months for the primary series (doses at 2,4, and 6 months), with the next dose not due until 4-6 years of age 1.
A third dose of poliovirus vaccine should already have been administered by 6 months 3.
Hepatitis B Timing
Hepatitis B vaccine series should be completed by 6 months (birth, 2 months, and 6 months) 1, 4.
No hepatitis B dose is due at 9 months in standard schedules 1.
MCV4 Age Restriction
Meningococcal conjugate vaccine (MCV4) has a minimum age of 11 years, making it completely inappropriate for a 9-month-old 1.
Meningococcal polysaccharide vaccine (MPSV4) has a minimum age of 2 years for high-risk children 1.
What Should Actually Be Given at 9 Months
In the United States: Typically no routine vaccines are due at 9 months - the next scheduled vaccines are at 12-15 months (MMR, varicella, hepatitis A, and the fourth DTaP dose) 1, 3.
In WHO-recommended schedules: Measles vaccine (or MMR where available) is given at 9-12 months 1.
Influenza vaccine may be given starting at 6 months if during flu season, requiring two doses one month apart for first-time recipients 1, 3.
Critical Clinical Caveat
If a child is behind schedule and has not completed their primary series by 9 months, catch-up vaccination should follow ACIP guidelines based on which specific doses were missed 1. However, this represents a deviation from the standard schedule rather than routine 9-month vaccinations.