title: Symposium introduction.
authors.affiliation: Department of Microbiology and Immunology, Johns Hopkins School of Hygiene and Public Health, Baltimore, MD, USA. wrbeisel@aol.com
authors.forename: William R
authors.initials: WR
authors.lastname: Beisel
mesh_terms: D003141:Communicable Diseases / Q000276:immunology / Q000378:metabolism*; D006801:Humans; D009747:Nutritional Physiological Phenomena