A Model System for Concurrent Detection of Antigen and Antibody Based on Immunological Fluorescent Method

Table 1

Five possibilities in this analytical strategy.

Case	Detection 1	Detection 2	Result
1	Positive (saturating)	—	Ag (active infection)
2	Positive	Positive	Ag + Ab (rare)
3	Positive	Negative	Ag (infection)
4	Negative	Positive	Ab (immunity)
5	Negative	Negative	—