Occasionally happens: "mass hysteria" doesn't happen often, but with vaccines, rumors can spread quickly through the internet, tv, newspapers, and magazines. There are rumors still circulating about the newest anti-cancer vaccines. Such rumors are unlikely to have arisen if the cancer being prevented is liver cancer (as in the hepb vaccine), but rumors travel fast when the cancer is cervical cancer and relates to sex.
Answered 12/4/2011
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Most of them did:: Most prominently, smallpox and dpt. http://www.historyofvaccines.org/content/articles/history-anti-vaccination-movements in both cases, vaccines saved thousands of lives in spite of having rare severe side effects; both were eventually replaced by safer vaccines once they became available. The MMR hysteria is unique in having least basis in reality.
Answered 10/3/2016
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