<p>Resident Mike Nail gets a free tetanus shot in Tuscaloosa, Ala. from a medical crew working in tornado-ravaged areasm May 2, 2011.</p>
February 18, 2015
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February 18, 2015 8 p.m.
Vaccine opposition has ebbed and flowed over centuries
Still an undercurrent of immunization dislike, distrust in U.S.
NEW YORK - They're considered one of mankind's greatest medical achievements, yet people have balked at vaccines almost since the time of the first vaccination - in 1796, when an English country doctor named Edward Jenner inoculated an 8-year-old boy against smallpox.