https://pubmed.ncbi.nlm.nih.gov/26657997/
Cell mediated immune responses following revaccination with an influenza A/H5N1 vaccine
CMI responses occur in adults administered influenza A/H5N1 inactivated influenza vaccine.
immune responses
https://www.merriam-webster.com/dictionary/revaccination
REVACCINATION Definition & Meaning - Merriam-Webster
The meaning of REVACCINATION is the act of administering a vaccine again some period after an initial vaccination especially to strengthen or renew the immune...
definitionmeaningmerriamwebster