Jablonka A, et al. - This study aimed at assessing seroprevalences against three of the most relevant vaccine preventable diseases (VPD) in a large representative cohort to adapt vaccination strategies. The previous studies indicated an overall satisfactory seropositivity against measles, rubella, and varicella in refugees entering Europe during the current exodus. However, this rate seemed insufficient for preventing transmission. For instance, the rate of 12.9–17.9% female refugees at reproductive age unprotected against measles and the low protection levels against varicella in minors observed in this cohort reinforced the necessity for stringent vaccination strategies in refugees coming to Europe during the current crisis.