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

Two people rescued after falling from lifeboat at Ogden Point

Crew members of the Explorer of the Seas cruise ship fell into the water Thursday night

Saanich pedestrian incidents reflect recent trends

76% of crashes involving pedestrians happen at intersections

Online blasting video helps ease Sooke residents concerns

Complaints of dust ongoing since 2017

Son of missing Oak Bay woman asks for continued public support

‘Because she is still out there, somewhere’

BCAM slated to get one of last remaining Lancaster bombers

Approval seems certain despite emotional Torontonian appeals

BC Games’ Athletes Corner: What’s your favourite pump up song?

Check out what’s playing in the earbuds of BC Summer Games athletes before they compete

Zone 6: Rugby star Maggie Banks carries family legacy to BC Games

Shawnigan Lake student and Coquitlam native following her parents to the national program

RCMP help to save goats from wildfire

The fast-approaching wildfire, sparked Thursday, forced the evacuation of five homes

VIDEO: Near drowning captured on popular B.C. river

Search and Rescue manager says the popular pastime of floating in the summer is inherently dangerous

Crosswalk vandalism leaves black mark for Cowichan as B.C. Games begin

Rainbow crosswalk defaced just days after being painted

Photo gallery: BC Games Day 1

A brief look at action from the 2018 BC Summer Games in the Cowichan Valley

UPDATED: Anti-pipeline campers digging in as eviction deadline expires

The City of Burnaby had ordered the Kinder Morgan pipeline protesters out for violating bylaws

Trump was taped talking of paying Playboy model: AP source

Source says former personal lawyer Michael Cohen secretly recorded discussion prior to 2016 election

BC toddler with ‘allergy’ to sun waiting for bone marrow transplant

Charlie Lock, 2, needs treatment for damage caused by rare disorder EPP

Most Read