White House budget officials said immunization levels were approaching the President's goals, so no more money was needed.

Developing countries have succeeded in raising immunization levels of children to about 80 percent.

The principal strategy to prevent mumps is to achieve and maintain high immunization levels.

The low immunization levels in these areas often parallel the absence or acceptance of other important preventive services.

In 1992, the overall immunization level was 55 percent.

The main achievement has been to raise the immunization levels of children in developing countries from under 20 percent to nearly 80 percent.

Tomorrow," he said, "we'll discuss immunization levels and all the options available throughout the voyage.

At the time, the national immunization level had fallen below 80%, and in part of North Dublin the level was around 60%.

Finally, we can look at the experiences of several developed countries after they let their immunization levels drop.

Data compiled by the Public Health Service show that immunization levels are substantially below the national average in some urban areas.