Abrupt transitions from reinfections in social contagions Jesús Gómez-Gardeñes, Alessandro S. de Barros, Suani T. R. Pinho and Roberto F. S. Andrade EPL, 110 5 (2015) 58006 Published online: 29 June 2015 DOI: 10.1209/0295-5075/110/58006