c1 Refereed Journal Article. Not checked in Sherpa, 03/11/11 RD. Changed title from: Responses of early life exposure of micro-organisms to allergies to Development of allergic responses related to microorganisms exposure in early life, all other details ok. Green in Sherpa, author can archive pre-print (ie pre-refereeing), author can archive post-print (ie final draft post-refereeing), email sent to Nagendra 15.11.11-MMM