infection A process of reproduction of a particular pathogen species inside some tissue of a particular host species. A reproduction of a pathogen organism of a particular biological taxon in a tissue of a host organism from another taxon. M. Brochhausen http://purl.obolibrary.org/obo/hp.owl William R. Hogan infection is reproduction of a pathogen inside some tissue of a host. By associating infection with the classes latent period and infectious period, which are associated with specific pathogen species and host species, Apollo-SV defines infection further as reproduction of a particular pathogen taxon inside some tissue of a particular host taxon. infection process process of infection biological_process