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Serological data.
| All patients (%) | Patients with EM = 943 (%) | Patients w/o EM = 317 (%) | |
|---|---|---|---|
| Cases w/o serology | 273/1,260 (22%) | 259/943 (27%) | 14/317 (4%) |
| Cases with serology | 987/1,260 (78%) | 684/943 (73%) | 303/317 (96%) |
| Positive IgM or IgG | 872/987 (88%) | 597/684 (87%) | 275/303 (91%) |
| Negative | 115/987 (12%) | 87/684 (13%) | 28/303 (9%) |
