What happens to the vaccination site?
A. Successful vaccination produces a red and itchy bump at the inoculation site within 3 or 4 days. In the first week, the bump becomes a large blister, fills with pus and begins to drain. In the second week, the blister begins to dry up and a scab forms. The scab falls off in the third week leaving a small scar. People who are being vaccinated for the first time may have a stronger “take” (a successful reaction) than those who are being revaccinated.
