title: The world we live in.
authors.affiliation: Medical Journal of Australia, Sydney, NSW, Australia. mja@mja.com.au.
authors.forename: Stephen
authors.initials: S
authors.lastname: Leeder
mesh_terms: D003140:Communicable Disease Control / Q000458:organization & administration*; D058872:Epidemics / Q000517:prevention & control*; D006801:Humans; D064307:Microbiota