Table 1.

Interpretation of molecular, serological and clinical examination.

rRT–PCR results	Serology results (IgM i/lub IgG)	Risk of infection		Interpretation
		High	Low
positive	IgM (+) i IgG (−)	+	–	early stage of infection
positive	IgM (+) i IgG (+)	+	–	active phase of infection
positive	IgM (−) i IgG (+)	+	–	late stage of infection, recurrent stage of infection
positive	IgM (+) lub IgG (+)	–	+	oligosymptomatic or asymptomatic infection, false–positive rRT–PCR, false–positive serology
positive	IgM (−) i IgG (−)	+	–	“window period”
positive	IgM (−) i IgG (−)	–	+	“window period”with oligosymptomatic or asymptomatic infection false–positive rRT–PCR
negative	IgM (+) i IgG (−)	+	–	early stage of infection, false–negative rRT–PCR
negative	IgM (−) i IgG (+)	+	–	late stage of infection, false–negative rRT–PCR
negative	IgM (−) i IgG (+)	–	+	past infection
negative	IgM (+) i IgG (+)	–	+	convalescence, false–negative rRT–PCR
negative	IgM (−) i IgG (−)	+	–	“window period”, false–negative rRT–PCR

“+” positive result or present risk; “−” negative result or absent risk.