Results of the EQA study for laboratories performing ELISA for the serological detection of West Nile virus.

WNV: West Nile virus; DENV: dengue virus; JEV; Japanese encephalitis virus; TBEV: tick-borne encephalitis virus; USUV: Usutu virus; Neg: negative control; Sc: Score; IgM: Immunoglobulin M; IgG: Immunoglobulin G; nd: not done;*: reactivity also with heterologous flaviviruses;S: commercial ELISA InBios;H: ELISA in-house test;E: commercial ELISA Euroimmun;Fcommercial ELISA Focus;B: commercial ELISA Bioscreen;P: commercial ELISA Panbio;T: commercial ELISA IDVET.