Through the needle-hole thus stained with dye it was possible to "superinject" antitoxin, using a slightly wider needle avoid back leak along the old needle track, and thus to ensure a distribution of both toxin and antitoxin solutions from the same point the skin.
Source: wiktionary
Since it was inconvenient to superinject at an interval shorter than 30 min. and since longer periods of up to 2 hr. between injection and superinjection gave no greater reduction, […]
Source: wiktionary
[…] by the introduction into test sites of histamine with the production of a wealing reaction or the superinjection of saline into the test site.
Source: wiktionary