title: Reply to eisenhut.
authors.affiliation: Department of Paediatrics, University of Oxford, United Kingdom.
authors.forename: Maximilian
authors.initials: M
authors.lastname: Muenchhoff
authors.affiliation: Department of Paediatrics, University of Oxford, United Kingdom.
authors.forename: Philip
authors.initials: P
authors.lastname: Goulder
mesh_terms: D000375:Aging / Q000276:immunology*; D003141:Communicable Diseases / Q000276:immunology*; D004198:Disease Susceptibility; D005260:Female; D006801:Humans; D008297:Male