Vaccinations are not always appropriate for some Canadians such as children or immunocompromised individuals.  If you are travelling to a country where there is a Government of Canada advisory warning against the outbreak of an infectious disease such as COVID-19, unvaccinated travellers will not be covered for this infectious disease regardless of their personal reasons for not being vaccinated. This only applies if there is an advisory in place, such as a level 3 or 4 risk level.