Usage Note
Vacciner is used both literally (vacciner contre la grippe — 'to vaccinate against flu') and figuratively — être vacciné contre quelque chose means 'to be immune to something' in the sense of having been burnt by it before. The related nouns are vaccin ('vaccine') and vaccination.
Examples
"Il faut se faire vacciner avant le voyage."
Natural Translation
You need to get vaccinated before the trip.

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