Results
Totally, 448 laboratory-verified pandemic influenza A (H1N1)
cases were investigated from the beginning of June 2009 to
the end of December 2009. The first sporadic cases of influenza
A(H1N1) in Uppsala County were detected in June 2009.
The main epidemic occurred during 5 weeks (from the end
of October until the end of November) when 375 (82%) of
the influenza cases were reported. Before and after these
weeks, only sporadic cases were reported (Figure 2). Most
cases were domestically infected, with only 35 persons
(8%) reporting that they had acquired the infection abroad
(defined as being abroad