Really? Why then in a survey I recently read does it show that the US has highest infant mortality rate along with the highest immunization rate? By contrast the countries with the lowest infant martially are also the countries that require the least immunization.I can't speak to the specific cases you mention, but generally speaking about vaccines, yes they do. A huge decrease in the incidence of the diseases in people who are vaccinated.
This sure looks like a cause and effect to me.