hypersusceptibility

https://doi.org/10.1351/goldbook.13244
Adverse immunological effects in an individual occurring under conditions of exposure to an allergen that result in no effects in the great majority of the population, or an individual exhibiting exaggerated effects in comparison with the great majority of those showing some adverse effects.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1180 [Terms] [Paper]