Ottawa-area measles cases prompt debate over mandatory vaccination

The reporting ofmeasles cases in the National Capital Region has put the spotlight on parents who decide not to get their children vaccinated,but an Ottawa researcher says the limited spread of the virus suggests current immunization policies are containing it.

On Saturday, Ottawa Public Health confirmed two children and one adult are being treated for measles.

The three either were not vaccinated, or did not have complete vaccinations in Ottawa and Lanark County.

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Health officials confirmed the virus was brought to the regionby a patientwho had travelled internationally, but forprivacy reasons, thedepartment won't disclose where thatpersontravelled.

There have been no new cases since.

High vaccination rate

Dr. Kumanan Wilson said the fact measles has not spread to more people suggests the vaccination rate among the general population is close to the 95 per cent threshold that provides "herd immunity."

"We haven't seen the sustained spread, which suggests that vaccination rates are pretty good and are preventing the spread," the Ottawa Hospital researcher says.

In 2014, measles spread from a single case of an unvaccinated child who contracted the illness while travelling in the Philippines. A total of four caseswere reported that year.

In most years, there are no measles cases in Ottawa.Wilson saidthe number depends onhow many non-immunized people are exposed to the virus.

"In a totally unvaccinated population, for each individual that gets measles,12 to 18 other individuals will get the condition," he said.

"That makes it one of the most infectious conditions we know of. The likelihood of spread is totally dependent on the immunization coverage they're surrounded by."

Mandatory immunization might not solve problem

Wilson said it's important that people recognize vaccines are effective and safe. People who can get vaccinated, should.

"People need to be immunized not only to protect themselves, but to protect others," Wilson said.

It's a sentiment shared by Ryan Knuth, whose two-month-old son Theorecently spent five days at Children's Hospital of Eastern Ontario (CHEO)after developing a fever.

Ottawa Public Healthcalled Knuth on Friday to let him know that Theo who is too young to be fully immunized against measles may have been exposed to the virus that causesthe disease.

"If you decide not to vaccinate your child, it'saffectingothers. And it can and will affect others," Knuth said. "Right now, my son is at home, at risk ofseverecomplications potentially even death because of exposure tomeasles."

Health Canada recommends thefirst dose of the measles vaccine be administered at 12 to 15 months old. It also recommendspeoplewith compromised immune systemsnot receive live vaccines.

The agency says people with severe acute illnesses should postpone receiving the vaccine.

Symptoms of measles include fever, runny nose, coughing and a red, blotchy rash after the fever appears. Complications can include hearing loss, pneumonia, brain swelling and even death.

Wilson saidthe current policy on immunization may work better than excluding children from school if theirparents object to shots for "philosophical reasons."

Public health officials are required to keep track of students' immunization records and can exclude children who have been exposed to the virus but don't have up-to-date shots.

Wilson said a more restrictive policy could make outbreaks worse.

"The risk of making it mandatory is that some parents may choose not to send their children to school and homeschool them, or put them in an alternative school system, inwhich caseyou get clustering groups of unvaccinated children,and that increases the risk of an outbreak substantially."

OttawaPublic Health said the immunization rate among Ottawa's school-age children is 98.4 per cent.

Associate medical officer of health Dr. Carolyn Pim said fewer than 10 children have been excluded from school in the current outbreak. She said the children will be assessed on a case-by-case basis to determinewhen they can return to classes.

Immunization proof should be required: CMA

The Canadian Medical Associationsaid proof of immunization should be required for all children attending licensed daycare or school in all provinces.

In a written statement, CMA president Granger Avery said the associationis concerned misinformation is creating doubt among some parents about the value of vaccines.

"The CMAis encouraging all provinces to establish immunization registries so that health-care workers have a better understanding of immunization levels in Canada to ultimately prevent a situation like the one currently unfolding [in Ottawa and Lanark County]," he said.