Before revision: We study and SI-type model , with the possibility of vaccination, where the population is partitioned between pro-vaxxers and anti-vaxxers  .
After revision: We interpret attitudes towards science and pseudosciences as cultural traits that diffuse in society through communication efforts exerted by agents. We present a tractable model that allows us to study the interaction among the diffusion of an epidemic, vaccination choices, and the dynamics of cultural traits. We apply it to study the impact of homophily between pro-vaxxers and anti-vaxxers .