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| IgM negative in the third trimester | IgM positive in the third trimester | Total | |
| IgM negative in the first trimester | 94 (96.91%) | 3 (3.09%) | 97 (100%) |
| IgM positive in the first trimester | 12 (52.17%) | 11 (47.83%) | 23 (100%) |
| Total | 106 (88.33%) | 14 (11.67%) | 120 (100%) |
