Flu vaccine less effective against mutant strain

B.C. Centre For Disease Control says some protection still better than none, flu season may be deadlier than usual for elderly

Dr. Danuta Skowronski is an epidemiologist with the B.C. Centre For Disease Control.

This year’s flu shot may prove less effective than usual because the dominant virus now circulating has mutated significantly in the months since the vaccine was devised.

The H3N2 strain – one of three targeted in this year’s flu vaccine – is thought to have changed its genetic makeup enough to possibly thwart the antibodies that the vaccine activates.

Dr. Danuta Skowronski, an epidemiologist with the B.C. Centre for Disease Control, is still recommending the vaccine, particularly for the elderly, the chronically ill and those with compromised immune systems.

“It’s not a perfect match,” she said. “But for the high risk, even an imperfectly matched vaccine is going to give cross protection. And for some people it could be life-saving.”

She said the H3N2 strain tends to be particularly nasty to the elderly and may bring a deadlier flu season than usual.

“We may see more hospitalizations or deaths this year,” Skowronski said.

She said it’s particularly concerning that the flu has struck B.C.  surprisingly early this season, causing outbreaks in eight seniors’ care homes.

MORE RESOURCES: Flu shot clinic locator

The vaccine was formulated last February because it takes six to eight months to produce in large quantities and the H3N2 virus is thought to have since mutated while circulating in the southern hemisphere.

Skowronski said it’s still not too late to get the shot and some protection when flu activity peaks in the weeks ahead, including any later surge of cases of influenza B, which tends to peak in March or April.

The vaccine also targets the influenza B and H1N1 viruses, but they’re considered less likely to cause illness this flu season.

Even in years when the vaccine is a better fit – last year’s was about 70 per cent effective against the then-dominant H1N1 strain – Skowronksi says everyone should wash their hands frequently and avoid touching their eyes, nose and mouth.

People who get the flu shot often mistakenly think any illness they contract can’t be flu and sometimes fail to get appropriate treatment.

“It doesn’t make you invincible,” Skowronski said.

Anti-viral medication can stop or fight an influenza infection but must be given quickly, ideally within 12 hours of the start of symptoms.

An estimated 3,500 Canadians die each year from flu complications – mainly seniors and others with underlying conditions.

Just Posted

Vopak expects 240 liquid gas-by-rail cars per day

North Coast residents can learn more about the Ridley Island-based project at the open houses

Ice Demons get an early start on the ice

The players are determined to score wins in this year’s league.

Focus groups important for age-friendly policy

These results will drive the age-friendly action plan

Is it a car? Is it a buggy? Yes, all of the above

Riverbank cleanup nets some odd items

Mobile complaint team coming to B.C.’s northwest

Ombudsperson’s office wants to hear from wronged residents

VIDEO: Rare close encounter with whale pod spotted off B.C. waters

Pod of southern resident orca whales breach within arms length of whale watchers

VIDEO: B.C. dairy farmer says Trump doesn’t understand the industry

‘They need supply management just as bad as we need to keep it’: sixth generation farmer Devan Toop

VIDEO: Death threat, racist comments spewed over empty seat on B.C. bus

Transit Police are investigating the incident, shared online by fellow passengers on Vancouver bus

Sister of plane crash victim that went missing in B.C. starting support network

Tammy Neron wants to help families who are searching for missing people

‘Hello, 911? There’s a horse in my living room’

Sproat Lake firefighters called to ‘rescue’ quarter-horse from Alberni Valley house

Assault charge withdrawn vs. ex-Jays pitcher Roberto Osuna

Former Toronto player agrees to peace bond

UPDATED: Bill Cosby gets 3-10 years in prison for sexual assault

Judge also declared the disgraced comedian a ‘sexually violent predator’

B.C. making progress on senior care staffing, Adrian Dix says

Minister aims to meet residential care provincial standard by 2021

B.C. realtor receives racist letter touching on ‘empty homes’

The letter has been met with condemnation of the racism after Winnie Wu posted it online

Most Read