antiserum

https://doi.org/10.1351/goldbook.A00406
serum containing antibodies to a particular antigen either because of immunization or after an infectious disease.
Source:
PAC, 1993, 65, 2003. 'Glossary for chemists of terms used in toxicology (IUPAC Recommendations 1993)' on page 2015 (https://doi.org/10.1351/pac199365092003)