has part has part is about has specified output has_specified_output count counting population survey exposed population population infection survey PopulationInfectionSurvey A population survey that counts the number of individuals in the population who are infected with a particular pathogen. A population survey that counts the number of individuals in the population who are infected with a particular pathogen. 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. Equivalent class was: 'population survey' and (has_part some (counting and (has_specified_output some (count and ('is about' some 'exposed population'))) and (has_specified_output some (count and ('is about' some 'infectious population'))) and (has_specified_output some (count and ('is about' some 'susceptible population'))) and (has_specified_output some (count and ('is about' some 'immune population'))))) Mathias Brochhausen contagious population