Booster shots may be given as part of a vaccination regimen. A booster shot is a

Booster shots may be given as part of a vaccination regimen. A booster shot is a second dose of the same vaccine given sometime after the original vaccination. Why are booster shots given if they are just a repeat of the same vaccination?
In treating a woman for breast cancer, the surgeon removed some axillary lymph nodes on the right side. After surgery, she experiences edema in the right upper extremity. Explain why this side effect occurred.