In addition, special attention
was directed toward patients with underlying medical risk
conditions. The laboratory-confirmed influenza cases were
reported using the unique national identification number
(Swedish: personnummer) complemented by patient records.
The analyses were performed via an electronic database
system (eCRF) and these data were entered into a case
report database system (SAS/PheedIt®). The present analysis
outlines a statistical description of study variables. In some of
the tables and figures a few individuals are missing because
relevant information was lacking. Under the Communicable
Diseases Act, the county medical officer plans, organizes and
runs communicable disease control and works to ensure
efficiency, coordination and standardization of this work.
The Communicable Diseases Act satisfies all reasonable
requirements for taking into account the respect for equal
value of all people and individual statutory rights. Written
informed consent of the study population was not necessary
because this study did not modify the existing diagnosis or
the therapeutic strategy. Moreover, all data samples were
under code and could not be associated with an identifiable
individual by the research team.