Measles immunity in relation to the years from last vaccination to testing.

The bar plots show the measles serostatus of patients prior to and after transplantation; according to the number of measles vaccinations administered prior to transplantation and in relation to time from last vaccination to testing. No significant trend was detectable. However, about 5–15% of patients who are seronegative at the time of transplantation are seropositive afterwards.