Migrants represent an under-immunized population in Europe, making them more susceptible to outbreaks of infectious diseases such as measles or varicella. Therefore, it is not a coincidence that migrant groups were disproportionately affected by COVID-19 during the pandemic. Similarly, other preventive services such as cancer screenings are less frequently utilized by migrant populations. Our goal is to assess factors that determine participation in preventive health, with particular attention to the mechanisms, and target strategies for improving access. To achieve this, we will conduct surveys in Germany and Turkey, examining non-migrant populations, refugees, and migrants.