Pauline Hanson has walked back one in a series of comments she made about childhood vaccinations, which prompted medical professionals and fellow politicians to label her as "uninformed" and "dangerous".
She apologised for comments that she made on Sunday in which she suggested that children could be tested for allergic reactions before being vaccinated.
Appearing on Channel 7's Sunrise on Thursday morning, the One Nation leader admitted that she was wrong in making the comments.
"A couple of doctors have said that there is no test. Yes. I do apologise. If that be the case, I am wrong," she said.
"It's a personal decision and I just want parents to make sure they do the right thing by the children, go and speak to the doctor, get the right advice."
Appearing on the ABC's Insiders program over the weekend, Hanson accused the government of "blackmailing" parents by withholding welfare payments for unvaccinated children.
Touching down in Perth shortly after, ahead of Western Australia's state election on Saturday, the One Nation leader urged parents to do their own research before immunising their children.
"I'm not telling people not to vaccinate their children, I'm telling people -- investigate it," she said.
"People have said they feel that their children may be allergic to it, have a test done.
"Apparently there is a test you can get done to see if the child is allergic to the vaccination or not."
The backlash to her comments began almost instantly with the senator's opinions attracting criticism from politicians and medical professionals alike.
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