Giraffe
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- Jun 20, 2015
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I opened this thread to post some stuff I come across regarding polio. If I cite sources this does not necessarily mean that I agree with them.
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According to reports polio cases caused by vaccines outnumber wild virus infections. This is what the WHO writes:
So say basically they say that thanks to poor sanitation the vaccine-virus can spread and "this can offer protection to other children through ‘passive’ immunization"; it only starts to become a problem when the virus is around long enough to be able to mutate.
In other papers WHO writes that in order to eradicate polio more than 95 per cent of a population needs to be immunized.
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It is inadequate sanitation what makes the spread of the virus possible.
Polio - Wikipedia
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Health officials are now rushing the approval and deployment of a new vaccine.
New Oral Polio Vaccine to Bypass Key Clinical Trials
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According to reports polio cases caused by vaccines outnumber wild virus infections. This is what the WHO writes:
WHO said:What is vaccine-derived polio?
Oral polio vaccine (OPV) contains an attenuated (weakened) vaccine-virus, activating an immune response in the body. When a child is immunized with OPV, the weakened vaccine-virus replicates in the intestine for a limited period, thereby developing immunity by building up antibodies. During this time, the vaccine-virus is also excreted. In areas of inadequate sanitation, this excreted vaccine-virus can spread in the immediate community (and this can offer protection to other children through ‘passive’ immunization), before eventually dying out.
On rare occasions, if a population is seriously under-immunized, an excreted vaccine-virus can continue to circulate for an extended period of time. The longer it is allowed to survive, the more genetic changes it undergoes. In very rare instances, the vaccine-virus can genetically change into a form that can paralyse – this is what is known as a circulating vaccine-derived poliovirus (cVDPV).
So say basically they say that thanks to poor sanitation the vaccine-virus can spread and "this can offer protection to other children through ‘passive’ immunization"; it only starts to become a problem when the virus is around long enough to be able to mutate.
In other papers WHO writes that in order to eradicate polio more than 95 per cent of a population needs to be immunized.
.....
It is inadequate sanitation what makes the spread of the virus possible.
Polio - Wikipedia
Wikipedia said:Poliovirus is usually spread from person to person through infected fecal matter entering the mouth.[1] It may also be spread by food or water containing human feces and less commonly from infected saliva.[1][3] Those who are infected may spread the disease for up to six weeks even if no symptoms are present.[1] The disease may be diagnosed by finding the virus in the feces or detecting antibodies against it in the blood.[1] The disease occurs naturally only in humans.[1]
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Health officials are now rushing the approval and deployment of a new vaccine.
New Oral Polio Vaccine to Bypass Key Clinical Trials
TheScientist said:And because of the compressed approval and deployment timeline, nOPV2 may be used in millions of kids beginning in mid-2020, before a Phase 2 trial in Bangladesh, which will pit the vaccine against real-world conditions such as co-infections with other enteroviruses, could finish.