An immunoperoxidase staining with antibody to CD-3, the T-lymphocytes in the myocardium involved in this acute cellular rejection phenomenon in a heart transplant recipient can be identified.

A kit for detection of antibody against porcine reproductive and respiratory syndrome virus (PRRSV) was prepared by immunoperoxidase monolayer assay (IPMA) and assembled as PRRSV-IPMA kit.