Igikoresho kigenewe kumenya neza antibodiyite ya IgM kugeza icyenda nyamukuru itera indwara zubuhumekero muri serumu cyangwa plasma.Indwara ziterwa na virusi zirimo: Mycoplasma Pneumonia, Chlamydia Pneumonia, ibicurane A, ibicurane B, virusi ya Parainfluenza Ubwoko bwa 1, 2 na 3, Virusi y'ubuhumekero, Adenovirus, Coxsackievirus Group B na Legionella Pneumophila Serum Type 1.