Eating dirt.
Callahan
Gerald N
GN
Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523, USA. gnc@lamar.colostate.edu
D000328:Adult; D000818:Animals; D002675:Child, Preschool; D018864:Cultural Diversity; D005260:Female; D006801:Humans; D010842:Pica / Q000382:microbiology / Q000469:parasitology / Q000523:psychology; D011247:Pregnancy; D012068:Religion and Medicine