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

Body found in Vanderhoof motel

Police currently investigating suspicious death

Bylaw barking up the wrong tree

Critics point out inconsistencies, other problems

Fatal collision claims life of community leader

On Friday, May 18, a collision, just eight kilometres east of Vanderhoof,… Continue reading

Ceremony an important step toward healing

Residential School survivors honoured

Presentations at council meeting suggest flooding is unlikely

Council and Rio Tinto cautiously optimistic

Black Press Media to launch Pipeline Full of Controversy series

Series covers Trans Mountain’s history, science, Indigenous reaction, politics and economics

B.C. RCMP swoop in to save injured eagle

An eagle with a broken wing now in a recovery facility after RCMP rescue near Bella Coola

Bug spray 101: Health Canada wants you to stay bite free

Health Canada is reminding Canadians to use bug spray and other insect repellents safely

Unions reject CP Rail contract offers

Both meeting Friday to determine next steps; 72 hours notice required before strike action.

B.C. jewellers warn public about fake gold scam

‘They are playing on people’s sympathy and their greed’

Former B.C. premier says pot industry about to enter Wild West

Mike Harcourt says Canada is about to enter a new gold rush with many dreaming of striking it rich

Hunt continues for two suspects in Ontario restaurant explosion

The explosion left 15 people injured, but all victims have now been released from hospital

B.C. teacher charged with sexual offences involving two teens

Henry Kang, 50, of Abbotsford charged with two counts each sex assault and sexual exploitation

Toronto Raptors star to hold basketball camp in B.C.

DeMar DeRozan is hosting a four-day camp for players aged 6-16 at the University of Victoria

Most Read