How does FDA's policy of temporarily deferring blood donors who have received a smallpox vaccine affect the blood supply?

At present, because vaccination plans are limited to healthcare workers, FDA does not anticipate a major impact on blood supply. The government is working with blood organizations to develop plans for ensuring an adequate blood supply should mass vaccination occur. It is suggested that all vaccinees save the written record of their vaccination. Saving this record will help to determine vaccination status, and donor eligibility in the event of a smallpox outbreak.