title: Various perspectives on the origins of pathogens: questions of evidence.
authors.affiliation: Simon Fraser University.
authors.forename: S L
authors.initials: SL
authors.lastname: Pigg
mesh_terms: D000569:Americas; D000723:Ancylostomatoidea / Q000254:growth & development / Q000472:pathogenicity; D000818:Animals; D018595:Colonialism / Q000266:history; D018562:Disease Transmission, Infectious / Q000266:history*; D005060:Europe; D049690:History, Ancient; D049691:History, Medieval; D006725:Hookworm Infections / Q000266:history* / Q000469:parasitology; D006801:Humans; D010164:Paleopathology / Q000592:standards