  Despite the increasing limitations for unvaccinated people, in many European
countries there is still a non-negligible fraction of individuals who refuse to
get vaccinated against SARS-CoV-2, undermining governmental efforts to
eradicate the virus. We study the role of online social media in influencing
individuals' opinion towards getting vaccinated by designing a large-scale
collection of Twitter messages in three different languages -- French, German
and Italian -- and providing public access to the data collected. Focusing on
the European context, our VaccinEU dataset aims to help researchers to better
understand the impact of online (mis)information about vaccines and design more
accurate communication strategies to maximize vaccination coverage.
