Table 1.

Definition of HBV and HCV infection groups.

HBV infection groups	Anti–HBc	HBsAg	Anti–HBs
Non–exposed a	Negative	Negativeb	n/a
Past infection: Resolved-HBV infection	Positive or indeterminate	Negative	positive
Past infection: Isolated anti–HBc	Positive or indeterminate	Negative	negative
Chronic HBV infection	Positive or indeterminate	Positive	negative

HCV infection groups	Anti–HCV	HCV–RNA
Non–exposed	Negative	Negative c
	Low–reactived	Negative
Past infection: Resolved-HCV infection	Positive	Negative
Chronic HCV infection	Positive	Positive

Anti-HBc, antibodies to hepatitis B core antigen; anti-HBs, antibodies to HBsAg; anti-HCV, antibodies to HCV; HBsAg, hepatitis B surface antigen; HBV, hepatitis B virus; HCV, hepatitis C virus; n.a., not available

^avaccination status unknown;

^bnot tested but assumed negative when anti-HBc was negative;

^cnot tested but assumed negative when anti-HCV was negative;

^dreactivity between 1.0–1.8.