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

Needles found at Goldstream campground in Langford

West Shore RCMP respond to several calls for service associated with homeless campers

Only tent city residents allowed access at Goldstream Park campsites

Local RCMP point to reports of criminal activity and drug use in the area as cause for safety concerns

School crossing guard clears truck debris left from evening crash

Truck crashes into hydro pole on Saanich/Oak Bay border

Paving complete, lines coming to the Malahat this week

$34 million safety project is 95 per cent complete with hope to relieve traffic congestion between Victoria and Nanaimo

Neighbours fear impact of tent city residents on Goldstream Provincial Park

Langford residents opposed to campers voice concerns at campground gate

5 things to do this weekend in and around Greater Victoria

Sooke Apple Fest returns, Saanich lights up with lantern festival and anarchists unite for downtown book fair

CUTENESS OVERLOAD: 2 sea otters hold hands at the Vancouver Aquarium

Holding hands is a common – and adorable – way for otters to stay safe in the water

B.C. teen with autism a talented guitarist

Farley Mifsud is gaining fans with every performance

Yukon man facing new attempted murder charge in B.C. exploding mail case

Leon Nepper, 73, is now facing one charge each of aggravated assault and attempted murder

B.C. man who left hospice to run in upcoming election dies

A week after leaving hospice to go to city hall to declare his candidacy, David Hesketh has died.

Tilray Inc sees $10-billion in market cap go up in smoke

Tilray’s share price closed at $123 US on Friday, a decline from its intraday peak of nearly $300 US earlier in the week

Breast density to be included in mammogram results across B.C.

The information is crucial in proactively reducing the risk of breast cancer, doctors say

Most Read