Group | Laboratory diagnostic criteria |
---|---|
Negative group | Negative by all serological and PCR tests |
Viremic 1ry infection group | Positive PCR ± IgM positive antibodies |
Convalescent-phase 1ry infection group | Either exclusively positive for IgM or dual positive IgM and IgG antibodies with an IgM/IgG ratio ≥ 1.2 |
Viremic 2ry infection group | Simultaneously positive PCR with positive IgG ± IgM antibodies |
Convalescent-phase 2ry infection | Negative PCR and dual positive IgM and IgG antibodies with an IgM/IgG ratio < 1.2 |
Previous exposure group | Exclusively positive for IgG antibodies |