A new billboard in Perth City has sparked controversy.
Doctors are angry a billboard by Learn The Risk has gone up at the corner of William and Brisbane Streets.
The American group is a prominent voice in the anti-vaccination debate, and but it's message in WA is unwelcome.
Health Minister Roger Cook said the billboard spreads a dangerous message.
"Vaccination is the single, biggest, public health exercise that's saved millions of lives, literally, around the world.
"I'm looking at what powers I have to take this billboard down," said Mr Cook.
The Australian Doctors Association has also expressed concern about the billboard's message.