When compared with global vaccine coverage estimates provided by the WHO Expanded Programme on Immunization, Canada appears to be one of the leading countries in childhood immunization, even when the comparison is limited to industrialized countries. The above data indicate acceptable coverage levels for the primary series of the routine vaccines. However, with time, the lag between the recommended age to receive the vaccination and the actual age of immunization increases. These figures also clearly indicate that much effort is still needed to increase coverage levels to reach national vaccination coverage targets. Also, despite overall high coverage, there are still small pockets of population with very low coverage.
Coverage is virtually zero particularly in some religious groups or sects which oppose immunization.
It is fortunate that individuals in these groups are partly protected by the high level of protection in the surrounding populations, which prevents direct transmission. However, recent measles outbreaks and, in particular, outbreaks of wild polio virus are reminders that these populations remain vulnerable. As well, less positive data have been obtained for vaccines recommended for adults. This suggests inaccurate recording of vaccinations as well as inadequate information given to vaccinees about the products they receive. Immunization programs, including education about recommendations for immunization and evaluation of coverage, have been directed mainly toward children.