Herd Immunity and Influenza Vaccine Uptake (HIIVU)
Influenza, Human
About this trial
This is an interventional prevention trial for Influenza, Human
Eligibility Criteria
Inclusion Criteria:
- At least 65 year old citizens in the municipalities of Espoo, Maalahti, Korsnäs, Kristiinankaupunki, Kaskinen and Närpiö
Exclusion Criteria:
-
Sites / Locations
- National Institute for Health and Welfare
Arms of the Study
Arm 1
Arm 2
Arm 3
No Intervention
Active Comparator
Active Comparator
Control
Mailing
Herd
There is no intervention (letter) in the control arm. There is no control arm in the city of Espoo. 1/3 of subjects in all other municipalities are assigned to the control arm.
This treatment arm consists of a standard letter reminding elderly citizens (65 years and above) about influenza vaccines that are available free of charge from the local health centers.
This treatment arm consists of a letter that highlights the herd immunity effects of vaccination and reminds elderly citizens (65 years and above) about influenza vaccines that are available free of charge from the local health centers.