Childhood microbial experience, immunoregulation, inflammation and adult susceptibility to psychosocial stressors and depression in rich and poor countries

Department of Infection, Centre for Clinical Microbiology, University College London, London, UK; Department of Psychiatry, College of Medicine and Norton School of Family and Consumer Sciences, University of Arizona, Tucson, AZ, USA; Department of Integrative Physiology and Center for Neuroscience, University of Colorado Boulder, Boulder, CO 80309-0354, USA. *Corresponding author. Department of Infection, Centre for Clinical Microbiology, University College London, London, UK. Email: [email protected]. Received 2 November 2012; revised version accepted 3 November 2012.