revaccinate

Recently the Russian press reported that Moscow had decided to revaccinate its entire population.

At that time, Federal health officials discussed the problem with medical experts and determined that there was no need to revaccinate those who received the weakened vaccine.

Blood Type A and Type AB should revaccinate more often--every 5 years.

Dr. Steve Wassilak, an immunization specialist at the centers, said, "It would be an expensive, exhaustive undertaking to revaccinate everybody born since 1957."