Increased influenza activity in Spain from mid-December 2004.
Centro Nacional de Epidemiología, Instituto de Salud Carlos III, Madrid. smateo@isciii.es
Salvador
S
de Mateo
Amparo
A
Larrauri
Carmen
C
Martín
D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D012621:Seasons; D013030:Spain / Q000453:epidemiology