Centers for Disease Control and Prevention (CDC) has announced it will investigate whether vaccines cause autism—a claim that has gained renewed attention under U.S. Health and Human Services Secretary Robert F Kennedy Jr. Despite a strong scientific consensus over the years, health experts are once again stepping forward to defend the safety of childhood vaccines and refute any connection with autism.The CDC’s announcement has reignited a longstanding debate surrounding a theory that lacks substantial scientific evidence. "As President Trump said in his Joint Address to Congress, the rate of autism in American children has skyrocketed. CDC will leave no stone unturned in its mission to figure out what exactly is happening," a department statement said. "The American people expect high-quality research and transparency and that is what CDC is delivering."Vaccines are widely regarded as safe and effective. Still, vaccine skepticism and hesitancy have contributed to declining childhood vaccination rates in the United States. Vaccinations help prevent the spread of infectious diseases and protect those who can’t receive them. Most health experts agree they do not cause autism.Experts told Healthline that there have been multitudes of reputable studies on the topic over the past 20 years, and none have established a definitive link between autism and childhood vaccines."The scientific community has researched this very thoroughly, and there’s no evidence that childhood vaccines cause autism," said Danelle Fisher, MD, a pediatrician at Providence Saint John’s Health Center in Santa Monica, CA. "Scientists from around the world have approached this question in several different ways and none has found a relationship," said Bryan King, MD, vice chair for child psychiatry and a professor at the University of California San Francisco. What Is Autism Spectrum Disorder?