One Nation leader Pauline Hanson last weekend posted a photo of herself and newly confirmed Western Australia Senator Peter Georgiou in hospital after Mr Georgiou contracted measles in Bali.
"Isn't it ironic," Senator Hanson wrote on Facebook.
"Our new Western Australian senator has caught measles in Bali after I caught foot in mouth earlier this week."
In comments branded "crazy" by health experts, Senator Hanson earlier this month appeared to voice anti-vaccination sentiments, casting doubt on the effectiveness of vaccines, urging parents to do their own research and accusing the government of blackmailing parents with its 'no jab, no pay' policy.
Senator Hanson later backtracked on part of her comments suggesting that parents should have their children tested to see if they were allergic to vaccines.
"OK, I admit I was wrong with that," she said.
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Mr Georgiou was confirmed as the federal One Nation senator for Western Australia last week.
He fills a vacancy left by his brother-in-law, Rod Culleton, whose election was invalidated when the High Court determined he was bankrupt.
After threatening to be a disruptive force in last Saturday's West Australian election, One Nation's results ultimately fell short of expectations - receiving just 4.7 per cent of first preferences on current counts.
The Nationals received 5.4 per and the Greens received 8.5 per cent.
Senator Hanson has since said she regrets a preference deal with the Liberals ahead of the WA vote - a political manoeuver which ultimately brought political pain for both sides.
"I won't be making the same mistake twice," she said on her Facebook account.
