Table. Results of ELISA and IFA testing of 118 serum samples initially positive for CCHFV by ELISA, Greece*.
| Result | No. (%) samples |
|||
|---|---|---|---|---|
| Initial ELISA† | CDC ELISA‡ | Ivanovsky Institute ELISA§ | IFA¶ | |
| High-positive | 76 (64.4) | 61 (51.7) | 73 (61.8) | 78 (66.1) |
| Positive | 29 (24.6) | 43 (36.4) | 30 (25.4) | 26 (22.0) |
| Low-positive | 13 (11.0) | 13 (11.0) | 13 (11.0) | 13 (11.0) |
| Negative | NA | 1 (0.8) | 2 (1.7) | 1 (0.8) |
*IFA, immunofluorescence assay; CCHFV, Crimean-Congo hemorrhagic fever virus; CDC, US Centers for Disease Control and Prevention; NA, not applicable. †Samples were initially collected and tested for IgG by ELISA (Vektor-Best, Novosibirsk, Russia) as part of 3 previous seroprevalence studies (9–11). ‡CDC, Atlanta, Georgia, USA (13). §Ivanovsky Institute of Virology, Moscow, Russia (12). ¶CCHFV Mosaic 2; Euroimmun Medizinische Labordiagnostika AG, Lübeck, Germany.