Small Pox Vaccines do not last your lifetime you have to get booster shots.
Yep. Their effectiveness wears off after 5-10 years, but nobody's really sure how much. People who are getting re-vaccinated have fewer side effects from the shot than people (like me) who were never vaccinated in the first place.
15 posted on 02/20/2003 4:27:37 PM PST by Asparagirl