1.   Children who received the vaccine five years ago are still being followed up and have long-term protection.

2.   As part of the approval, the FDA required further studies to monitor the incidence of blockages among the infants who received the vaccine.

3.   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.

4.   A randomly selected two-thirds will receive the vaccine and the rest will receive a placebo.

5.   Also waiting are hundreds of customers of Insource, another Schein subsidiary, that have not received any vaccine.

6.   But Bush said he was hesitant to back universal vaccination of the American public because of the likelihood that a small percentage of those receiving the vaccine would die.

7.   California, for example, received vaccine with a low level of the virus.

8.   Currently, children receive the vaccine four times between the ages of two months and four years.

9.   Fourteen years later, following isolated reports linking the virus and human cancers, Fraumeni decided to look at another group that had received contaminated vaccine.

10.   Half of those received the vaccine, half a placebo.