Administering All Vaccines at Once for a 12-Month-Old Behind on Vaccinations

Benefits of Simultaneous Administration

Administering all indicated vaccines at the same visit increases the likelihood of complete vaccination and provides timely protection against preventable diseases, according to the Clinical Infectious Diseases guidelines 1
The immune response to one vaccine is not negatively affected by another vaccine when administered simultaneously, as stated by the Clinical Infectious Diseases guidelines 1
Simultaneous administration reduces the number of clinic visits needed to catch up on vaccinations, improving compliance with the recommended schedule, as recommended by the Clinical Infectious Diseases guidelines 1

For children who start late or who are >1 month behind, the Centers for Disease Control and Prevention recommends following the catch-up immunization schedule to bring them current with recommended vaccines 3
A vaccine series does not need to be restarted, regardless of the time that has elapsed between doses, according to the Clinical Infectious Diseases guidelines 1
Minimum intervals between doses should be respected to ensure adequate immune response, but longer-than-recommended intervals do not reduce final antibody concentrations, as stated by the MMWR Recommendations and Reports guidelines 4

Licensed combination vaccines can be administered whenever any components of the combination are indicated, other components are not contraindicated, and if the vaccine is licensed by the FDA for that dose of the series, as recommended by the Clinical Infectious Diseases guidelines 1
Using combination vaccines is preferred over separate injections of equivalent component vaccines to reduce the number of injections, according to the Clinical Infectious Diseases guidelines 1

Before administering multiple vaccines, check for any contraindications such as immunodeficiency, severe allergic reactions to vaccine components, or moderate to severe acute illness, as recommended by the MMWR Recommendations and Reports guidelines 5, 6, 7
For children with specific conditions (e.g., HIV infection), special considerations may apply regarding which vaccines can be administered simultaneously, according to the MMWR Recommendations and Reports guidelines 5, 6, 7
Misunderstanding contraindications may lead to inappropriate deferral of needed vaccines, as stated by the MMWR Recommendations and Reports guidelines 4