Authors´ conclusions: the risk of developing herpes zoster is higher among those exposed to the disease than among the vaccinated. Before systematic vaccination, the incidence is higher and onset earlier when infection takes place between one and two years of age. During vaccination period, those with chickenpox with two or more years of age, have an increased risk of herpes zoster.
Reviewers´ commentary: although the study does not analyze costs, prevention of disease without increasing the incidence of herpes zoster would be in favor of routine vaccination against varicella in childhood. The impact after a longer period of monitoring implementation of universal vaccination should be analyzed.