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Globally, and because of vaccines, cases of measles have declined, polio has almost been eradicated and major infections like smallpox and rinderpest have been eradicated.
Centers for Disease Control and Prevention study shows MMR(V) vaccines slightly increase risk of benign seizures in children aged between 6 months and 5 years.
The mumps vaccine is only approximately 85% effective. In 2014, a community in Ohio had an outbreak of hundreds of cases of mumps virus, many of which cases involved university students who had previously been vaccinated against mumps.
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The hypothesis of British doctor Andrew Wakefield's 1998 study (which suggested a causal link between the MMR vaccine and autism) was not, and has never been, proven. Wakefield was, however, funded by companies that stood to profit from generating anxiety around the MMR vaccine.
Many countries that were recently on the brink of eradicating certain diseases are now seeing those diseases rise again due to vaccine hesitancy. Vaccine hesitancy is among the World Health Organisation's top ten threats to global health.
Building your immunity to certain diseases naturally (by getting them) can increase the probability you won't get them again over taking vaccines. This is because the dose of the virus or bacteria is larger and your exposure is longer.
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World Health Organisation reports that the benefits of the MMR vaccine, which is often the object of parental concern, far outweigh the risk of possible side effects.
Using WHO data, The Guardian reported that measeles is at a 20-year high as a result of anti-vaccine movements in Europe. In 2018, there were twice as many deaths (72) from measles as there were in 2017.
World Health Organisation connects dramatic decline in cases of measles in the 1960s with the licensing and use of measles vaccine.
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Over the course of the 1970s and 1980s, three countries (UK, Sweden and Japan) cut back on the pertussis (whooping cough) vaccine due to fears over its safety. In each country, the result was a dramatic increase in cases of and deaths from pertussis.
Study by National Center for Biotechnology Information (NCBI) establishes a causal relation between various vaccines (DT, Td, tetanus toxoid and MMR) and anaphylaxis, some cases of which have resulted in death.
Though the measles vaccine is 99.99% effective, on rare occasions measles can overcome an individual’s immunity and give them the (potentially dangerous) disease. In 2011, a woman in New York caught measles even though she’d had the vaccine.
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Genetics, immune status, age, health and nutritional status are all crucial factors in the effectiveness of vaccines. For example, poor health can limit your body’s ability to make antibodies, therefore decreasing the probability of immunisation.
Children who are not vaccinated can become carriers who spread diseases which could potentially kill less healthy children.
Myriad types of adverse events and side effects following the taking of (all types of) vaccines by (all ages of) people were reported in the Vaccine Adverse Events Reporting System (VAERS), including several deaths.
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Though they have live viruses in them, most vaccines contain just a small amount of inactive toxins or stripped down micro-organisms. Even those vaccines with whole germs in them have negligible potency.
Many cases that seem to show a causal link between vaccines and death contain numerous other possible causes. These include inappropriate handling, contamination and errors in quality control.
Regardless of whether it's encountering natural infection or vaccine, the immune system has the same response: detect, defeat and remember. Given natural infection is a high-risk approach and vaccination low-risk, vaccination makes for a much safer means to an end.
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HPV vaccine has a higher purity protein which results in a better immune response; Tetanus's toxin is so potent that a lower dosage (in vaccine) actually leads to longer-lasting immunity; Hib and Pneumococcal vaccines bind aspects of target microbes to create better immunity.
After showing there is some association between influenza vaccine and increased risk of respiratory viruses, this study suggests the influenza vaccine could cause a biological mechanism that reduces immunity to noninfluena viruses.