reinjection

noun

re·​in·​jec·​tion ˌrē-in-ˈjek-shən 

1

: an injection made subsequent to a previous injection

After the initial treatment, reinjection with collagen at intervals is required to maintain full correction.

—Elizabeth A. Abel et al.

2

: the return or replenishment of something by injection especially following removal

… a special preparation of T cells: cells that were taken previously from the same individual, infected with the HIV-vaccinia vector and then killed before reinjection.

—Thomas J. Matthews and Dani P. Bolognesi

reinject

-ˈjekt 

transitive verb

The technique would involve removing diseased stem cells from the fetus's bloodstream, transferring healthy genes into them, and reinjecting the treated cells into the fetus.

—Pat Ohlendorf-Moffat