特異性：Parainfluenza 2 & 3 (all antigens) Cross-reacts with type 2. Minimal reactivity with type 1. Some cross-reactivity with bovine parainfluenza-3 and canine parainfluenza. Does not react with HEp-2 cells by indirect immunofluorescence.
純度：Purified IgG fraction of antiserum covalently coupled to a highly purified preparation of Horseradish Peroxidase (RZ>3). Care is taken to ensure adequate conjugation while preserving maximum enzyme activity. Free enzyme is absent. Estimated molar HRP:IgG
