By antigen

By an·ti·gen

see Blood Groups Appendix.
References in periodicals archive ?
Diagnosis of histoplasmosis by antigen detection based upon experience at the histoplasmosis reference laboratory.
In recently vaccinated persons, memory cells are expanded by antigen reexposure, and their increase in frequency could be quantitatively detected by the rapid flow cytometric T-cell assay, confirming the efficacy of vaccination.