Figure 1.

Relative prevalence of sentinel and routine influenza A viruses in Denmark 1999 to 2006. The actual numbers of influenza A positive samples for the respective seasons are as follows; 1999–2000 49, 2000–2001 28, 2001–2002 80, 2002–2003 61, 2003–2004 83, 2004–2005 91 and 2005–2006 54.