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→Herd immunity and mandatory vaccination
The USA has mandatory vaccination according to an official CDC schedule. Enforcement is left to the states. Most states have medical and religious exemptions. Some states make it very easy to opt out of vaccines, while other states strictly enforce compliance for school attendance. The difference in vaccination rates between these states is actually very slight, and not nearly enough to affect herd immunity.
The USA has mandatory vaccination according to an official CDC schedule. Enforcement is left to the states. Most states have medical and religious exemptions. Some states make it very easy to opt out of vaccines, while other states strictly enforce compliance for school attendance. The difference in vaccination rates between these states is actually very slight, and not nearly enough to affect herd immunity.
== Adverse Reactions ==
Vaccines are not completely harmless, and many have a significant morbidity and mortality associated with them. Postvaccinial encephalitis is a known hazard of [[smallpox]] vaccine, for example. A recently-introduced vaccine against [[human papilloma virus]], the [[causative agent]] of [[cancer]] of the [[uterus|uterine]] [[cervix]], has now been linked to a number of sudden deaths reported within days of its administration.<ref name=GardasilMM>Cockcroft, Lucy, "[http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2007/10/29/njab129.xml Cervical cancer drug Gardasil linked to deaths]," ''[[London]] Daily Telegraph]]'', October 29, 2007. Retrieved November 10, 2007.</ref>
==References==
==References==