TABLE 3.
Proportion of sera correctly identified as having been collected within or after 2 months of primary infection, using either lysed whole-cell Toxoplasma antigen (standard assay) or MIC3 avidity assays
| Time of serum collection (n) | Diagnostic criterion (% IgG avidity) | % of sera for which collection time was correctly identified
|
|
|---|---|---|---|
| Standard assay | MIC3 (8 M urea) | ||
| Within 2 mos of infection (20) | <10 | 90 | 90 |
| <14 | 95 | 100 | |
| <20 | 95 | 100 | |
| More than 2 mos after infection (97) | >10 | 95 | 100 |
| <14 | 92 | 100 | |
| <20 | 85 | 86 | |