Usage Note
Immunitaire is a technical adjective used exclusively in biomedical contexts — you will see it in système immunitaire (immune system) and réponse immunitaire (immune response). It does not mean 'immune' in the legal or figurative sense; immunisé covers that. The noun immunité is feminine.
Examples
"Son système immunitaire est affaibli."
Natural Translation
His immune system is weakened.

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