Table 1. Number of participants and serological methods used by participating laboratories during the 2010 and 2013 WNV ILPTs.
| Participants | Number | IgG ELISA kit | In-house IgG ELISA | IgM ELISA kit | In-house IgM ELISA | WNV VNT | |
|---|---|---|---|---|---|---|---|
| 2010 ILPT | NRLs | 17 | 19* | 1 | 3 | 1 | 8 |
| other European participants | 2 | 1 | 1 | 1 | 1 | 0 | |
| Kit manufacturers | 1 | 0 | 1 | 0 | 0 | 0 | |
| Mediterranean and Balkans NRLs | 1 | 1 | 0 | 0 | 0 | 0 | |
| Total | 21 | 21* | 3 | 4 | 2 | 8 | |
| 2013 ILPT | NRLs | 21 | 21* | 1 | 13 | 0 | 7 |
| other European participants | 9 | 4 | 2 | 7 | 1 | 2 | |
| Kit manufacturers | 3 | 2 | 0 | 2 | 0 | 0 | |
| Mediterranean and Balkans NRLs | 2 | 1 | 0 | 2 | 0 | 0 | |
| Total | 35 | 28* | 3 | 24 | 1 | 9 |
*some participants used more than one kit. Ig: immunoglobulin; ILPT: inter-laboratory proficiency tests; NRLs: National Reference Laboratories; VNT: virus neutralisation test;WNV: West Nile virus