RT-PCR	IgM	IgG	Diagnosis
–	–	–	Negative
+	–	–	Initial stages of infection
+	+	–	Early stage of infection
+	+	+	Active stage of infection
+	–	+	Advanced stage of infection
–	+	–	Early stage—false-negative RT-PCR?
–	+	+	Disease in progression
–	–	+	Resolution stage of infection