RT Journal Article SR Electronic(1) A1 De Mateo, S A1 Larrauri, A A1 Martin, C A1 Grupo de Vigilancia de la Gripe en España, Collective YR 2005 T1 Increased influenza activity in Spain from mid-December 2004 JF Weekly releases (1997–2007) VO 10 IS 3 SP 2620 OP DO https://doi.org/10.2807/esw.10.03.02620-en UL https://www.eurosurveillance.org/content/10.2807/esw.10.03.02620-en