IPA: //vækˈsɪn.i.əl//
KK: /vækˈsɪnɪəl/
Connected to a virus called vaccinia, which is related to cowpox and is used in vaccines.
The vaccinial properties of the cowpox virus are important for vaccine development.
Vaccinial → It is derived from "vaccinus" (from Latin, meaning pertaining to cow, as in cowpox) and the suffix "-ial" (meaning relating to or characterized by). The word "vaccinial" refers to something that is related to vaccines or vaccination, particularly in the context of cowpox and its historical use in vaccination.
Think of 'vaccinus' which relates to cows and vaccination — this helps you remember that 'vaccinial' means related to vaccines.