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Experts from the CDC Answer Questions About Vaccines

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From the National Center for Immunization and Respiratory Diseases at CDC, introducing
Medical Officer Andrew T. Kroger, MD, MPH
Nurse Educator Donna L. Weaver, RN, MN
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QUESTION: If a child only received a half dose of live attenuated influenza vaccine (LAIV, FluMist, MedImmune), I understand they are not considered immunized. Can the child receive inactivated influenza vaccine (IIV) on the same day?
ANSWER: You are correct that a half dose of LAIV (or any other vaccine) is a non-standard dose and should not be counted. If you weren't able to give the second half of the LAIV at that same appointment, you will need to provide another full dose of influenza vaccine at another visit. If you want to try using a different type of vaccine, you can give IIV any time after the partial dose of LAIV. If you want to give LAIV again, you should wait four weeks because it is a live vaccine.
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