A Pickering mother who lost a young daughter to a blood infection a little over two years ago is lashing out against those opposed to measles vaccination after her newborn was possibly exposed to the virus at a doctor’s office in Markham.

Jennifer Hibben-White took to Facebook Tuesday to say she’s “angry as hell” at anti-vaccination believers after York Region Public Health informed her Monday that she, her son and her mother were “potentially exposed to the measles virus while attending a newborn weigh-in appointment at a Markham doctor’s office on Jan. 27.

Her infant, Griffin, who was 15 days old at the time, hasn’t yet been vaccinated for measles, as that procedure isn’t done before a child reaches 12 months.

York health officials confirmed the region’s first case of measles Wednesday.

“I was informed that someone who later developed measles sat in the doctor’s waiting room ... before we arrived,” Hibben-White says in the posting, adding that she was instructed to stay away from small children.

But she said she’s always around Griffin and her three-year-old daughter, Aurelia, “who has only been able to get one (measles) vaccine so far.

“(Aurelia) is now, technically, exposed too,” she wrote. “If we develop any ... (symptoms), we are to call my doctor and arrange to come in under official medical precautions.”

Dr. Michael Finkelstein, of Toronto Public Health, said death from measles is uncommon in medically advanced societies, but that it’s always a possibility.

Hibben-White lost her five-year-old daughter, Olivia, to septicemia in 2012, according to a news report from last year.

In her Facebook posting, she puts the blame for her current predicament squarely on the shoulders of those opposed to measles vaccination.

“If you have chosen to not vaccinate yourself or your child, I blame you,” she stated. “You think you are protecting them from autism? You aren’t. There is ... nothing in science that proves this. If you want to use Google instead of science to ‘prove me wrong,’ then I am happy to call you an imbecile as well as misinformed.”

And because there is an incubation period with measles, Hibben-White said she’ll have to wait until Tuesday to find out whether either of her two kids has contracted the virus.

Griffin’s dad, Glenn White, said the family is still dealing with the tragedy of losing a child.

“And then we get a scare like this and you’re like, what the hell...,” said Glenn, adding that both he and Jennifer were vaccinated as kids.

He said the individual with measles in the doctor’s office that day was a vaccinated adult.

Her Facebook post had been shared more than 225,000 times as of 3 p.m. Wednesday.

Hibben-White’s Facebook post had been shared more than 225,000 times as of 3 p.m. Wednesday.

She declined to comment for the story.

Dr. Lilian Yuan, of York Region Public Health, said officials began contacting people most at risk Monday and will contact those of lower priority by mail.

There are currently six known cases of measles in Toronto and a total of eight in Ontario.