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There's no reason to believe that vaccines cause autism. There's no correlation, there's no plausible causal mechanism. It's perfectly reasonable to dismiss antivaxxers as irrational cranks.
>There are probably medicines out there right now having side effects that will get them banned when they are discovered but how are you going to allow the people who discover that to come forward when there is a multi million industry built on that drug and a culture that wants to send them to plague island for being crazy because they question the status quo?
We're constantly looking for those effects through a huge international collaboration. Dozens of drugs have their warning labels changed or their market authorisation restricted every month based on a serious scientific effort to discover unexpected drug interactions and effects.
If anyone believes that a vaccine caused a case of autism, they're entitled to raise a concern through the MHRA's Yellow Card scheme, which will be fed into the WHO's pharmacovigilance database. A full-time team at the Uppsala Monitoring Centre analyse that data, looking for signals that might indicate a drug safety risk.
Those Yellow Card reports have been filed, the data is in VigiBase, multiple studies have been conducted and no link has been found. If anyone has data demonstrating that vaccines do indeed increase the risk of autism, then international action will be taken in a matter of weeks. Nobody has such data, but there are thousands of people who like to spend their free time slandering and intimidating scientists and clinicians based on their completely spurious beliefs.