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Alledaagse Vragen
Waar komt een griepgolf vandaan?
Beschrijving van de aflevering
Het heerst! Dat hebben vast veel mensen tegen je gezegd in de afgelopen paar weken. We zitten midden in een griepepidemie. Maar waar komt zo'n epidemie opeens vandaan? Dat hoor je van viroloog Ab Osterhaus.