immunocompetence (n.), immunocompetent (adj.)

https://doi.org/10.1351/goldbook.13277
Having the ability to exhibit an immune response.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1185 [Terms] [Paper]