RESULTS	Following the booster dose , a robust anamnestic response was developed in all of 8 intramuscular revaccinees and 11 controls but 16 of 18 intradermal revaccinees , who lost anti-HBs of > or = 10 IU/L over time , and geometric mean titers of anti-HBs climbed to 208 , 105 , and 549 IU/L , respectively .\