RT Journal Article SR Electronic(1) A1 Twisselmann, B YR 2000 T1 Influenza B virus in seals in the Netherlands JF Weekly releases (1997–2007) VO 4 IS 22 SP 1594 OP DO https://doi.org/10.2807/esw.04.22.01594-en UL https://www.eurosurveillance.org/content/10.2807/esw.04.22.01594-en