No shot, no school.

It’s been done before — unvaccinated children have long been banned from classes in Ontario — and one of Calgary’s top health officials says it’s time for Alberta to ponder the same.

“I think that’s something worth considering, and other provinces have done that,” said Dr. Judy MacDonald, medical officer of health for the Calgary zone.

“They do require that children coming to school produce their immunization records.”

The sucking sound you hear is Alberta’s anti-vaccine lobby gasping with indignant horror.

Their retort is predictable: Parents who are unwilling to jab their kids, having decided vaccines are unsafe and/or part of a global conspiracy by the pharmaceutical illuminati, are going to rant about rights.

That includes the right not to put poison in their children’s bodies, the right not to accept government direction on medicine, and the right to an education for their precious offspring.

Of course, not a one will mention the rights of other students and adults attending the same school.

You’d think there would be a right to the best possible protection against horrible diseases like measles, diphtheria and polio, but no.

At the moment, a school system that will outlaw peanut butter sandwiches for fear of making somebody sick willingly accepts unvaccinated students, despite the high likelihood of those kids playing petri dish to an infection like measles or whooping cough, once exposed.

When the number of people vaccinated falls below a certain threshold — health agencies aim for the high 90s, percentage-wise — herd immunity begins to fail, and diseases once thought beaten make a comeback.

Diseases like measles, which killed 122,000 in 2012, according the World Health Organization.

Alberta, with an average vaccination rate of 84% — and as low as 42% in some regions — had 42 cases of measles last year, and there have been seven cases in Calgary in 2014.

Between January 1, 2001, and December 31, 2011, there were only 25 cases of measles reported in all of Alberta.

MacDonald says that with serious infections just a plane ride away, that dwindling vaccination rate in some areas of Canada make the return of dreaded diseases like measles a serious concern.

“With measles especially, it’s such an infectious disease, easily spread through the air — it’s a virus that will find people who are susceptible,” said MacDonald.

Right now in Alberta, the right of the minority to not vaccinate tramples the right of the majority to stay healthy.

It’s why provinces like Ontario and New Brunswick have already done what the Calgary medical officer of health is suggesting.

Ontario refuses admittance to any student without vaccination records.

Last month, more than 500 students were suspended in the Waterloo Region, because they were not up to date on their vaccinations — and the same happens to hundreds of other kids every year in school districts throughout the province.

Generally, parents are told their child has been suspended, and a fast trip to the clinic follows.

Some still refuse, and that’s their right.

There is a way for Ontario parents to avoid vaccinations and still send their children to school.

It requires them to speak to health-care professionals about the value of vaccinations, and if they still believe it’s the wrong choice, they can apply for a special exemption.

It’s hard work to officially say “no” — a whole lot harder than taking your child to the clinic for their shots.

Many parents, when receiving information from an actual doctor rather than Jenny McCarthy and the Internet, choose to vaccinate after all.

And those who still believe vaccines are bad at least get an education about what their unprotected child might mean to the health of others, including pregnant women and those undergoing cancer treatment.

That education is essential, said MacDonald.

“I tell people that is their right not to immunize, but please make an informed decision. And then if you continue to decide against having them immunized, you are aware you still have responsibilities to others,” said MacDonald.

“Some people cannot be immunized, and it’s society’s responsibility to protect them, too.”