Gallup recently conducted avaccination-centered survey of over 1,000 adults in all 50 states of the U.S.

They found that the amount of Americans in support of vaccination is 84%, a 10% decrease from 2001. 46% of those surveyed said they were “unsure” whether autism was caused by vaccinations.

An alarming 10% said they do believe the debunked myth that vaccines cause autism. On the other hand, 45% of respondents said vaccines don’t cause autism, which is a 4% increase from 2015’s 41%.

Although a majority of Americans are in support of vaccinations, its effectiveness depends on herd immunity. In the case of measles, around 92 to 95% of the population must be vaccinated in ordered to prevent the pathogen from transmitting.

According to the U.S. Centers for Disease Control and Prevention, measles cases in the U.S. surged to a 25-year high in 2019. 88% of those cases originated in close-knit communities with low vaccination rates.