Envisaged even before the COVID-19 pandemic, the project recognized the importance of vaccination in the cross-border area and set out to research the level of immunity protection in the border area population relating to infectious diseases. They developed a joint, simple and cost effective methodology to analyse the individual imnunity status against such infectious diseases as measles, mumps and rubeola in the population. The project resulted in several joint scientific publications, as well as recommendations on the vaccination policies for the future, especially in light of the challenges that the public health institutions are faced with. These include the growing scepticism in the population, resulting in the possible re-appearence of diseases that have been eradicted in the past in both countries thanks to well-organised public health.