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Someone who understands that doctors and immunologists have a far greater understanding of the risks and benefits of vaccine safety than a self described expert on social media or a blog. A pro-vaxxer is often vocal because they understand that diseases like whooping could (pertusis) continue to cause until suffering and even death; but is very preventable with a safe vaccine. Pro-vaxxers are often scientists, doctors or people who have lost loved ones dues to vaccine preventable diseases.
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