The spokesperson also said the process for combating vaccine misinformation is ongoing and that Instagram is considering additional ways it can address the issue on the platform. It is also considering adding a pop-up message with factual information about vaccines to some hashtags, the spokesperson said.

Instagram also said Thursday that now when it blocks a hashtag with a certain term, it will also block that term from being searched entirely. For example, Instagram said, if a user were to type “vaccinescauseautism” into Instagram’s search, no results would appear because #VaccinesCauseAutism is a blocked hashtag. When CNN Business performed that search on several phones, however, results did appear, including hashtags like #vaccinescauseautismreadthestudies.

Hashtags that have a smaller percentage of health-related misinformation will only show a limited number of posts, the spokesperson said.

The spokesperson would not elaborate on how much misinformation has to appear under a given hashtag for it to be banned, saying the company didn’t want users to be able to game the system.

“Vaccines are extremely safe. Serious adverse reactions are very, very rare. It’s very unfortunate that there would be such a hashtag because it’s going to scare people,” Daniel Salmon, a professor at the Johns Hopkins Bloomberg School of Public Health and director of the Institute for Vaccine Safety, told CNN Business Wednesday. “If you scare people, less people will get vaccinated and you’ll have outbreaks of things like measles which can kill children.”

Scientists have repeatedly and consistently debunked the most common anti-vax myth, the idea that there is a connection between vaccinations and the development of autism in children. Reputable organizations like the American Medical Association and the American Academy of Pediatrics say that vaccination for children is crucial to public health.

Experts are concerned that anti-vax content and misinformation spreading online can discourage people from getting vaccinated or leave them vulnerable to contracting potentially deadly diseases such as measles. The number of measles cases reported this year in the United States had climbed to 764 as of Monday, according to the US Centers for Disease Control and Prevention.

Facebook (FB), which owns Instagram, first said two months ago it was working to address vaccine misinformation on its platforms, including not showing or recommending misinformation about vaccinations on Instagram’s Explore page or hashtag pages.