As social media and search platforms grapple with their role in helping anti-vaccine propaganda spread, Pinterest has opted to block vaccine-related searches entirely until it can come up with a better way to monitor posts.

“We are doing our best to remove bad content, but we know that there is bad content that we haven’t gotten to yet,” Ifeoma Ozoma, a public policy and social impact manager at Pinterest, told The Guardian. “We’re hoping that we can move from breaking the site to surfacing only good content. Until then, this is preferable.”

It’s not an entirely new practice for Pinterest, which said it is has been blocking certain vaccine-related searches since last year. But the renewed interest in online misinformation ― fueled by a growing measles outbreak in Washington state that shows what can happen when parents don’t vaccinate their children ― has put a new spotlight on the effort.

An attempt to search “vaccine” on Pinterest on Thursday yielded a blank screen. A search for “MMR,” the vaccine for measles, mumps and rubella, also turned up no results.