Ikhithi yenzelwe ukufunyaniswa okusemgangathweni kwezilwa-buhlungu ze-IgM ezichasene neNtsholongwane yoMkhuhlane uhlobo A/B kunye neNtsholongwane yeParainfluenza kwigazi elipheleleyo lomntu, kwiserum okanye kwiplasma, kwaye inokuba luncedo ekuxilongeni koMkhuhlane A/B kunye nosulelo lweVirus yeParainfluenza.
