population immunity survey A population survey that assesses the level of immunity against a particular pathogen in a specified population. A population survey that assesses the level of immunity against a particular pathogen in a specified population. Comment from Mike (to do!): I checked because an infection and immunity census would involve two different census methods. One would be some kind of disease surveillance that counts infections. The other is some kind of immunity census process based on seroprevalence studies or vaccination registries. Mathias Brochhausen population survey