[1] IFREMER, Lab Microbiol, F-44311 Nantes 03, France
[2] Swedish Inst Infect Dis Control, Dept Virol, S-17182 Solna, Sweden
[3] Inst Marine Res Austevoll, N-5392 Storebo, Norway
[4] Reg Ctr Communicable Dis Control, S-29185 Kristianstad, Sweden
[5] Linkoping Univ, Dept Mol Virol, S-58185 Linkoping, Sweden