Table 1. Laboratory stages of primary HIV infection based on the emergence of viral markers.

Stage	RNA	P24 antigen	Antibody (ELISA)	Western blot
I	+	–	–	–
II	+	+	–	–
III	+	+	+	–
IV	+	+/–	+	I
V	+	+/–	+	+ b
VI	+	+/–	+	+

I, indeterminate;

b, without p31 band