RT Journal Article SR Electronic(1) A1 Upphoff, H YR 1998 T1 Current influenza activity in Europe: data from EISS JF Weekly releases (1997–2007) VO 2 IS 10 SP 1249 OP DO https://doi.org/10.2807/esw.02.10.01249-en UL https://www.eurosurveillance.org/content/10.2807/esw.02.10.01249-en