Vaccines cause autism – Myth
A small 1998 study by Andrew Wakefield claimed to find a link between the measles, mumps, and rubella (MMR) vaccine and autism, setting off a panic that led to dropping immunization rates, and subsequent outbreaks.
Since then, the study’s been deemed flawed, and it’s been retracted by the journal that published it. In 2004, the Institute of Medicine released a report that found no scientific evidence of a link between the MMR vaccine and autism. In September 2010, the CDC published similar results.