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Viruses in Vaccines that can mutate and spread
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[QUOTE="Ygggdrasil, post: 6238169, member: 124113"] There are four main types of vaccines in common use today: 1) live, attenuated vaccines (LAVs), 2) inactivated vaccines, 3) subunit vaccines, and 4) toxin vaccines. Only LAVs carry the rare risk of infecting the individual who receives the vaccine. Inactivated vaccines contain dead virus, subunit vaccines carry only small pieces of the virus, and toxin vaccines carry portions of molecules created by pathogens (such as the bacterial toxins that cause tetanus). LAVs are created by manufacturing versions of the virus that contain mutations that should prevent the virus from replicating inside of the host. In rare instances, these mutations can revert to their original forms to produce a virus capable of replicating and causing disease. This occurs very rarely (e.g. the [URL='https://vaccine-safety-training.org/live-attenuated-vaccines.html']World Health Organization[/URL] says that the oral polio vaccine causes polio in only 0.0002 – 0.0004% of cases; for every million people that are vaccinated, only 2-4 individuals will become infected). LAVs are not more prone to other types of mutations than the normal virus, and would not have an increased risk acquiring mutations that confer new traits such as becomming airborne. In the case of a LAV becoming infectious, the mutations are restoring an ability to the virus that we knew the virus was already capable of performing. Mutations that confer new abilities to a virus (e.g. causing a non-airborne virus to become airborne) are observed very rarely. LAVs would be much less likely to contribute to the evolution of a new virus that viruses in the wild because: 1) the virus is incompetent for replication and already requires several mutations to become infectious again, so additional mutations on top of those would be even more rare, and 2) individuals infected with LAVs are presumably living under conditions where others around them are being vaccinated, so the virus would have difficulty finding unvaccinated hosts. For more information about the different types of vaccines, see: [URL unfurl="true"]https://www.vaccines.gov/basics/types[/URL] [/QUOTE]
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Viruses in Vaccines that can mutate and spread
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