A person opposed to the use of vaccines citing insignificant outliers on other non-scientific research to support their position.
Anti-vaxxers on Twitter cite studies they don't understand and articles from sites like Mercola, Natural News and Stephanie Seneff's.

Anti-vaxxers lack comprehension of basic immunology, biology and human decency.
by Palamino Princess August 28, 2015
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A person dead set on listening to conspiracy theories about "Big Pharma" and ignoring all evidence to the contrary. Hallmarks of your typical anti-vaxxer include a staggeringly overinflated ego, pervasive selfishness, and insistence that they know more than real doctors/researchers because they read mommy blogs. An anti-vaxxer is also likely to view children as their property with no medical rights of their own (MY child, MY choice).
Joe: Why do things like measles and pertussis still kill people today?

Martha: Because anti-vaxxers only care about themselves and their "rights" to control their children. Science has eradicated these diseases - it's too bad it's fashionable for anti-vaxxers to flout science and make their children suffer with preventable diseases.
by Tess of the d'Ubershills August 27, 2015
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Someone who eschews legitimate scientific research and the advice of most of the medical community, putting unsuspecting others in harm's way.
Her ignorance led her to become an anti-vaxxer despite current scientific literature running contrary to her beliefs.
by RagnarPickles August 28, 2015
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A person who subscribes to the delusional belief, counter to the consensus of the scientific community, that vaccine use is unnecessary and/or unhealthy.
I saw an Anti-Vaxxer on Facebook talking about how there was no risk involved in getting measles.
by Trybutez August 28, 2015
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Someone who rejects medical advice and scientific consensus about the efficacy and safety of vaccinations. Typically pairs with anti-government paranoia, anti-corporate sentiment, conspiracy theories, and the "appeal to nature" fallacy. Anti-vaxxers also spawned the movement of autism-trutherism, which claims that autism is caused as a response to adjuvants found in vaccinations.

While there are several common schools of thought among anti-vaxxer circles, specific claims will often change about why vaccinations are harmful. The anti-vaxxer will single out benign ingredients as being particularly toxic regardless of its concentration, or sometimes that inoculation itself is a sham practice and was never necessary. Many anti-vaxxers instead champion "natural immunity," which involves actually contracting the disease that is vaccinated against in hope that they will be less susceptible to it in the future.

Tactics often include the "argument from ignorance," the "appeal to nature," and "begging the question."
My kid got measles from Disneyland because a bunch of unvaccinated kids showed up. Stupid anti-vaxxer parents are killing kids!
by Molasseswar August 28, 2015
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One who spent 20 minutes reading titles from a google search and now believes they are better educated than doctors who spend 10 years combined in medical school and residency. Synonym: Dunning-Kruger.
The anti-vaxxer spent 20 minutes Googling and decided they knew more than doctors who spend their entire lives studying the subject.
by VicRMCX August 29, 2015
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A particularly stupid brand of conspiracy theorist who believe watching a YouTube carries the same weight as a medical degree.
Sherri is an amazingly stupid anti-vaxxer. She even believes in chemtrails!
by Sherri Tenpenny August 29, 2015
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